You definitely need one of those sticky bras or a backless, strapless bra. I considered going without one, but decided to do the sticky bra. It worked great, even though I was a little nervous about flashing some side-boob. The only real con was that I am 5'2 and even though I got the size 0, the back is very long. It's really pretty, like a wedding-dress train, but I had a lot of people step on it or trip on it. This situation might be fixed with getting higher heels (mine were about 3 inches). Or you can do what I did and just hold up your train when walking/dancing

Red Trumpet Gown

Jill Jill Stuart

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Size Worn: 0R

Usual Size: 0

Height: 5' 2"

Weight: 100lbs

Bust: 32A