Sea Through
Size Guide
Almost nothing, worn close to the body. So fit matters here — here's how to find yours.
Start here
- Every product page has its own size chart, in the size tab. For the piece you're buying, that chart is the source of truth.
- Brands size differently — even from one bodysuit to the next. Go by the chart on the item in front of you, not a number you saw on another product.
- Between two sizes? Choose the larger for a more comfortable fit.
- Swimwear and bodysuits can fit differently from your usual clothing size. Measure before ordering rather than reaching for your normal size.
How to measure
You'll need a soft tape measure. Keep it level, snug but not tight.
- Chest / bust — around the fullest part of your chest. Wear the bra you'd normally wear with the piece, or no bra for swimwear.
- Underbust — directly under the bust, where a bra band sits. Firm and level.
- Waist — the narrowest part of your natural waist, just above the navel. Stand naturally; don't hold your breath.
- Hips — around the fullest part of your hips and seat, tape level.
Bodysuits
Bodysuits run S–XL (some lines add XXL). The exact measurements live on each product page, since they vary by brand. Two notes:
- Most are true to their chart.
- A few lines run slightly smaller — go by the chart and measure rather than assuming your usual size.
A typical bodysuit chart looks like this. It's an example — check the size tab on your piece for its real numbers:
| Size | Hips (cm) | Chest (cm) | Waist (cm) |
|---|---|---|---|
| S | 92–95 | 85–88 | 66–69 |
| M | 96–98 | 89–92 | 70–73 |
| L | 99–102 | 93–96 | 74–77 |
| XL | 103–106 | 97–100 | 78–81 |
When you try one on, keep the hygiene liner in place.
Swimwear
Swimwear sizing can differ from your regular clothing size — measure rather than assume, and size up if you're between two.
One-piece swimsuits. Sized by hips, underbust and chest. Some styles use cup + band sizing (e.g. 75B, 80C) — for those you'll need both your underbust (for the band) and your chest (for the cup). Some ranges start at L, where L is closer to a general EU S/M — go by the measurements on the chart, not the letter.
To find your cup, take chest minus underbust:
| Difference | Cup |
|---|---|
| 12–14 cm | A |
| 14–16 cm | B |
| 16–18 cm | C |
| 18–20 cm | D |
| 20–22 cm | E |
| 22–24 cm | F |
If your difference lands on the boundary between two cups, choose the larger.
Swim shorts. Measurements are on the product page — check the size tab before ordering.
Cover-up. One size, and it can be tied several ways. Dimensions are listed on the product page.
Keep the hygiene liner in place while trying on any swimwear.
Skirts
Each skirt's measurements are on its own product page — check the size tab before ordering, and email us if a chart isn't shown for the piece you want.
The Sea Edit (designer swim)
Designer pieces — Gucci, Versace, Brunello Cucinelli, Burberry, Zimmermann, Jacquemus, Eres, Toteme, Ami Paris, Lido and Oseree — follow each label's own sizing, which can differ from ours. Use the size information on the product page, and email us if you'd like measurements before you buy.
Bags
No sizing needed — dimensions are listed on each product page.
Still not sure?
Email hi@seathrou.com or call +30 210 100 2000 with the piece you're looking at and your measurements, and we'll point you to the right size. We're here Monday–Friday, 10:00–18:00 CET.
And if the fit isn't right when it arrives: returns are free within 14 days of delivery. Try it on at home with the tags on and the hygiene liner in place. There are no direct exchanges — email us your order number and we'll send a prepaid return label, then return the original (ship within 7 days of the label) and place a new order in the size you need. Your refund lands within 5–7 business days of us receiving the return.