wow are you very slim and small sized?
I am 1.7m tall and wear UK10-12. So usually the gowns would fit me. Haha but of course, there are gowns I couldn't squeeze in as well.
And I realise for me, the top of my shoulder to the bust, is longer than most girls. So usually straps are too short for me and need to be lengthened. Or the cups of the gown would be too high for me. This is my usual problem. Hope you know what I am describing
Hmm if the gowns are too loose, the coordinator would usually take a clip to clip the excess cloth at the back, so you can still have an idea how it looks on you.