The best swimsuit for a teen is one that fits comfortably, stays in place during the activity, and offers the coverage she wants. Start with how it will be used: swim lessons, regular practice, a beach trip, or a mix of activities. Then compare the actual size chart, fabric, straps, lining, and care instructions.
There is no single “teen size.” Girls’ and women’s swimwear use different measurements, and two suits with the same number can fit differently. The options below include both ranges so you can compare the right measurements rather than choose by age alone.
Quick guide: what kind of swimwear should you choose?
- For lessons and regular pool sessions: start with a swim-specific one-piece that allows comfortable overhead arm movement. Check the manufacturer’s chlorine-resistance description and the fit around the straps and openings.
- For a two-piece option: a tankini or separate swim top and bottom lets you choose the combination you prefer. Separates sold individually also allow different top and bottom sizes.
- For long sleeves: compare a rashguard with your chosen swimsuit or swim bottoms. Check whether the listing is for a top alone or a complete set.
- For shorts-style coverage: look for swim shorts or board shorts, checking the inseam, waistband, and whether a swim liner is included.
If the suit is for a school, camp, club, or water park, check its clothing requirements before buying. Let the person wearing it choose the colors, neckline, sleeve length, and coverage she feels comfortable with.
Four practical options to compare
These are different kinds of swimwear, so choose by purpose rather than treating them as an interchangeable ranking. Check the selected color, size, and included pieces on the linked page before ordering.
1. Speedo Girls Endurance+ Medalist One Piece, Red: a pool-training option
The red Endurance+ Medalist, model 8134576446, has a medalist back and classic coverage. Speedo lists the main fabric as 53% polyester and 47% PBT and describes it as resistant to chlorine and pilling. The back design is intended to allow shoulder movement, making this a useful starting point for lessons or regular swimming.
Fit detail: the product page lists girls’ age-label options through 15–16. Use the measurements for that exact product; do not assume a size from everyday clothing will transfer. A one-piece also needs enough torso length to feel comfortable when reaching overhead.
Trade-off: this style has neither sleeves nor shorts. If those are priorities, compare a rashguard or swim shorts as part of the outfit.
See the Speedo Medalist’s details and size chart
2. TYR TYReco Women’s Maxfit, Solid Navy: a one-piece in women’s sizing
The TYReco Maxfit, model MSO1A, color 402 Navy, is worth comparing when a women’s size chart is a better match. TYR specifies a medium neckline, wider straps, a keyhole back, and a moderate leg cut. Its listed material is 80% recycled nylon and 20% LYCRA XTRA LIFE fiber.
Fit detail: use TYR’s women’s swim chart, including the torso measurement. The page uses numeric swim sizes alongside letter labels; those numbers are not ordinary dress sizes.
Trade-off: the back has an opening, and the torso length is fixed. Compare both the front and back views if back coverage matters, and try another cut if the shoulders pull even when the other measurements seem right.
See the TYR TYReco Maxfit and its sizing
3. ROXY Girls’ Whole Hearted Long Sleeve Rashguard, Bright White: a long-sleeve layer
The Bright White version, style 25RWSIK53S-104-PC, is a fitted rashguard with a crew neckline and long sleeves. ROXY lists jersey fabric made from 86% polyester and 14% elastane. The listed girls’ size labels include L12/14 and XL16.
Fit detail: this is a swim top, so plan for the swimsuit or swim bottoms you will wear with it. Check sleeve length, shoulder movement, and how the hem feels when you reach forward.
Trade-off: a fitted rashguard will feel different from a loose swim shirt. Choose the intended cut instead of relying on a much larger size to change the fit. The girls’ and women’s Whole Hearted products have similar names, so check the full product title and chart.
See the ROXY girls’ rashguard details
4. Lands’ End Women’s 5-inch Board Shorts with Panty: a separate swim bottom
For someone who wants shorts-style coverage and fits the women’s chart, compare the 5-inch Board Shorts with the attached-panty lining option. On the linked product page, confirm the lining selection and size range along with the color. These shorts are a separate bottom, so a swim top or rashguard completes the outfit.
Fit detail: check the waistband and leg openings while sitting and bending. A 5-inch inseam describes the garment; where it lands on the leg will vary from person to person.
Trade-off: shorts add a different shape and amount of fabric from a conventional swim bottom. Check the selected variant’s material and care label, especially when comparing different colors or similarly named lined and unlined versions.
See Lands’ End’s 5-inch board shorts and lining options
How to choose the right swimsuit size
Use a soft measuring tape and the instructions on the exact product’s chart. Take the measurements privately and record only what you need for shopping. For a one-piece, look for chest, waist, hip, and torso or body-loop guidance. For separates, compare the top and bottom independently.
- Check the unit and size system. Inches and centimeters, girls’ age labels, numeric swim sizes, and women’s clothing sizes are different systems.
- Use the product’s chart. A general brand chart may include sizes the particular style does not offer.
- Include torso length for one-pieces. Follow the brand’s measuring diagram rather than substituting height for a body-loop measurement.
- Recheck before each purchase. A size that worked last season is a starting point, not a guarantee.
For example, Speedo’s chart for the red Medalist lists the 13–14 label with chest, waist, and hip measurements of 33, 27, and 35.5 inches. That is an example from one product chart, not a general rule for everyone aged 13 or 14. Consult the full chart and measuring instructions.
If measurements fall across different sizes, ask the brand which fit dimension to prioritize for that style or compare another cut. For a two-piece, individually sold separates may solve a top-and-bottom sizing mismatch. Avoid buying a noticeably loose suit solely to leave growing room.
A practical try-on checklist
Try the suit on indoors with tags and hygiene liners intact, following the seller’s return conditions. Before deciding to keep it:
- Raise both arms and make a gentle swimming motion. Straps should stay in place without uncomfortable pulling.
- Sit, bend, and reach. Check for pinching, gaping, rolling waistbands, or a hem that needs constant adjustment.
- Check the neckline, back, and leg openings against the coverage you actually want.
- Notice seams, labels, fasteners, and lining. An irritating detail is worth addressing before the first swim.
- Try together any pieces you intend to layer, including the rashguard and swim bottoms.
A dry try-on helps evaluate fit, but it cannot establish every aspect of wet performance. Check the return policy before swimming in a new suit.
Fabric and care: what matters most
Read the exact composition instead of relying on a fabric name alone. The Speedo option above uses a polyester/PBT blend; the TYR option uses nylon with LYCRA XTRA LIFE fiber; and the ROXY rashguard uses polyester with elastane. Those are different constructions, and the fiber percentages alone do not establish which will feel best or last longest for a particular swimmer.
For frequent pool use, look for an explicit chlorine-resistance description on the specific product. That description does not remove the need to rinse and care for it. Also check which areas are lined and whether the listed materials refer to the outer fabric, lining, or both.
Speedo’s swimwear care guide recommends rinsing in fresh cold water after use, drying in the shade, and avoiding tumble drying and leaving a suit wrapped in a wet towel. Its guidance also cautions against abrasive surfaces that can snag fabric.
Follow the care label on the actual garment. Washing instructions can differ between brands and products, so do not assume that a machine-wash instruction on swim shorts also applies to a training suit. Unpack swimwear after the trip home, let it dry as directed, and inspect stretched straps, thinning fabric, and loose seams before the next outing.
Common questions
Should a teen buy girls’ or women’s swimwear?
Either can be appropriate when the measurements, torso length, cut, and coverage work. Compare the charts rather than treating the department name as an age rule.
Is a one-piece better than a tankini?
A one-piece is a simple starting point for regular swimming, while a tankini offers a two-piece arrangement. The better choice depends on fit, the activity, and the wearer’s preference. Check how each stays in place during the try-on.
Does a rashguard come with swim bottoms?
Only if the listing says it is a set. The ROXY option above is a top. Check the included pieces before comparing total outfit cost.
What should I check before ordering?
Confirm the full model name, color, size chart, lining, included pieces, care instructions, and return conditions. A familiar product name or size label is not enough to identify the exact version.
Bottom line: choose the activity and preferred coverage first, then use the exact size chart and a careful try-on to narrow the options. A comfortable suit that lets you move without repeated adjustments is the useful goal.
