Bra for low cut dress and small chest?

[nonsensicalmess]

I've bought the dress below for a wedding - it fit beautifully in the skirt part but the top was a bit gapey in the sides and the shoulders were a bit low so I've had it professionally altered.
Wearing my usual bras under it you can still see a bit of bra from the side. I'd like a bra suitable for a deep neckline that's not full cup coverage so you can't see it as much from the side if that makes sense?! If it gave my small chest a bit of a boost then all the better Only one I've seen that fits the bill is a wonder bra one but it's £40 and might only get used once or twice so a cheaper alternative would be fab.

Any suggestions?

www.debenhams.com/webapp/wcs/stores/servlet/prod_10701_10001_152010837760_-1

Have you looked at something like this? Wonder bra do a strapped version similar but it’s £40 against this one for £25.. handy to have for anything backless too!

I have the wonderbra ultimate U plunge, it’s really good.. although I’m a 34G and had to buy a 36FF as they didn’t go up into the G’s lol.

If that bra can hold up my ladies, it will work for anyone.

First link doesn’t work:

www.missguided.co.uk/catalogsearch/result?q=Plunge+bra

I previously linked to the black one with straps but they have others!

Love the look of the misguided one so have ordered that!

Yes it's that wonderbra one @throw! Might give the boux one a go..... thanks!