Choosing the right size can make the difference between a bikini that flatters and one that feels uncomfortable.

If you've ever hesitated when buying online, this guide will help you understand how to choose your bikini size correctly, for both the top and the bottoms.

Why getting the size right matters

A bikini that's too small:

• Digs in too much

• Doesn't support well

• Shifts when you swim

One that's too big:

• Slips down

• Doesn't lift

• Loses its shape in the water

The right size flatters, holds you in and gives you confidence.

How to choose your bikini size: the top

The top is the trickiest part because it has to support your bust properly.

Step 1: Measure your underbust

Place the tape measure just under your bust, straight and snug.

That number gives you your band size (85, 90, 95…).

Step 2: Measure your bust

Measure the fullest part of your bust without pulling tight.

The difference between the two measurements gives you your cup size (A, B, C, D…).

Signs the top ISN'T your size

❌ Your bust spills over the top
❌ The back band rides up
❌ The straps dig in
❌ The cups gape

If any of these happen, you need to change the size or the style.

An important tip for each style

• Halter bikini → it should support without putting too much strain on your neck.

• Bandeau bikini → it should feel firm when dry.

• Underwired bikini → the wire should fully encircle the breast.

How to choose your bikini size: the bottoms

Bottoms are simpler, but they're also key to a flattering look.

Step 1: Measure your hips

Measure the widest part of your hips, keeping the tape straight.

Signs the bottoms aren't your size

❌ They dig in too much at the sides
❌ They slip down when you walk
❌ They wrinkle
❌ They don't cover properly

The ideal size holds you in without squeezing.

General guide

(It always depends on the brand, but as a standard reference:)

• XS → Hips 84–88 cm

• S → 88–92 cm

• M → 92–96 cm

• L → 96–100 cm

For the top, it's ideal to combine band and cup size if the brand allows it.

What if I'm between two sizes?

It depends on the effect you want:

• More hold → go for the smaller size if the fabric is stretchy.

• More comfort → go for the larger size.

• With unstructured styles (bandeau) → a firm fit is better.

• With tie styles → you have room to adjust.

A common mistake when choosing a bikini size

Buying the same size as your underwear without checking the specific size guide.

Every brand's pattern can vary slightly, so it's always important to check the actual measurements.

Conclusion

Knowing how to choose your bikini size isn't complicated if you:

• Take your measurements properly

• Check the size guide

• Take the style into account

• Prioritise support and a natural fit

A well-chosen bikini flatters more than any trend.