And as you can see from the dress on the Budget Fashionista's blog, many of them are not kind to women with armpit fat (and that dress is on a model). (thefashionablehousewife.com)
I had a strapless, and I was a bit heavier than I usually like to be, and I didn't have armpit fat in any of my pictures. (itsbecauseithinktoomuch.com)