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Bra extenders: a quick fix for a tight band

A bra extender adds a few centimetres to your band by clipping onto the hooks. It is brilliant short term, but if your band is always too tight, the real fix is a different size.

A bra strap on a bare shoulder, in black and white
Photo: @grundsteins (opens in a new tab) on Unsplash

By Jenisha Jonchhe Researched and tested where possible Updated

Affiliate links: this guide links to Amazon UK. As an Amazon Associate, My Bra Size earns from qualifying purchases. It never changes the advice or the size we suggest.

What to search for on Amazon UK

Add your UK size to the search on Amazon (for example “34G”). Not sure of it? Use our bra size calculator first.

  1. 1

    Bra extender multipack (2 and 3 hook)

    Several widths and colours in one pack, so you can match your bras’ hook counts.

    Search Amazon UK for bra extender 2 hook 3 hook pack (affiliate link, opens in a new tab)
  2. 2

    Wide bra extender (4 hook)

    For fuller-bust bras with four hooks; a narrow extender on a wide band twists and digs in.

    Search Amazon UK for bra extender 4 hook (affiliate link, opens in a new tab)
  3. 3

    Maternity bra extender

    Soft, stretchy extenders give a little room as your ribcage expands in pregnancy.

    Search Amazon UK for maternity bra extender soft (affiliate link, opens in a new tab)

As an Amazon Associate, My Bra Size earns from qualifying purchases. Links open Amazon UK; prices and stock are set by Amazon and its sellers. Search results change often, so a product appearing there has not necessarily been tested. Product photos, where shown, come from Amazon. How we handle affiliate links

A bra extender is a short strip of hooks and eyes that clips onto your bra fastening, adding a few centimetres to the band. It is a simple fix when a band feels temporarily tight. If the band is always too tight, a different band size will fit better.

When a bra extender helps

  • Pregnancy, as your ribcage expands.
  • A new bra that feels tight before the elastic relaxes slightly.
  • Bloating or weight that changes through the month.
  • Recovery after surgery, when you need a gentler band for a while.
  • Breathing comfort in a firm sports or strapless bra on a long day.

When it is the wrong fix

The band supplies most of a bra’s support. An extender loosens it, so the straps start to carry more weight. If you need an extender all the time, measure again with our bra size calculator, or try your sister size: one band size up and one cup size down. Our sister size calculator lists the options.

How to choose the right extender

  1. Count the hooks across your bra’s band: one, two, three or four. Your extender should match.
  2. Check the hook spacing, the distance between the hooks. Packs usually list it.
  3. Pick the length: most add one or two band sizes.
  4. Match the colour if the fastening will show through clothes.

A mismatched extender twists, digs in or comes undone, so it is worth buying a multipack with several widths.

How to wear it

Fasten the extender to your bra’s eyes, then fasten your bra’s hooks to the extender. Start on its loosest setting and check the band still sits level across your back. If the band rides up, the extender is too long.

Questions people ask

Do bra extenders affect support?
Yes, a little. The band does most of the supporting, and an extender loosens it. Use one for comfort in the short term, not to make a band that is too small fit long term.
How do I choose the right bra extender?
Match the number of hooks (rows of hooks across the band) and the spacing between hooks to your bra. Most packs include common sizes, and the hook spacing is usually printed on the pack.
Can I use a bra extender during pregnancy?
Yes. Your ribcage expands during pregnancy and an extender can keep your current bras comfortable for longer. Many people later move to nursing bras.
My band is always too tight. What size should I try?
Go up one band size and down one cup size, which keeps a similar cup volume. For example, 34E becomes 36DD. Our sister size calculator shows the options.

Written by

Jenisha Jonchhe

Jenisha Jonchhe is a New York-based fashion writer and designer with academic training in fashion design. She writes research-led bra sizing and fit guides for UK shoppers.

Researched from brand and retailer size guides, and tested hands-on where possible. Search results on Amazon change often, so a product appearing there has not necessarily been tested. How we research and test