Bra Size Guide

Find Your Perfect Bra Size

Getting your bra size right makes more difference than you might think. A well-fitting bra is more comfortable, gives better support, and looks far better under clothing — yet research suggests that the majority of women are wearing the wrong size without even realising it.

Our bra size finder asks a few simple questions about how your current bra fits and uses your answers to suggest whether you need to go up or down a size — or whether you're already in the right place.

How to use the bra size finder

Simply select your current band and cup size, then answer the questions about how your bra feels. The tool looks at everything from how your band sits to whether your cups are gaping or overflowing, and gives you a personalised size recommendation in under two minutes.

What's your current bra size?

If you're not sure, take your best guess — we'll help from there.

A new bra should fasten on the loosest hook. As it stretches with wear, move to tighter hooks.

How does the back band feel?

The band provides around 80% of your support — it should feel snug but not painful, with room for two fingers underneath.

How do the cups fit?

Select all that apply.

A couple more things…

This helps us give you the most accurate recommendation.

How long have you had this bra?

How do the straps behave?

What if I'm still not sure? Online tools are a great starting point, but nothing beats being properly measured in person. If you're in Jersey and want to be sure you're in the right size, we'd love to see you in store. Our team at Plums offers free bra fittings and can help you find not just the right size but the right style for your shape and lifestyle. Whether you've never had a fitting before, you've recently had a baby, lost or gained weight, or you've just never quite found a bra that feels right — a fitting takes around 15 minutes and can be genuinely life-changing. There is no need to book and appointment, just visit us at 7 La Colomberie, St Helier, Jersey.