My BMs are my two younger sisters and FSIL, and though I haven't picked out BM dresses, we've started to gather ideas before we all go together and try them on. The samples at stores are always too big and need to be clipped. Because of that, and with my experience of having tried some on myself for friends' weddings, it's a little hard for me to tell whether or not a dress will fit comfortably before actually getting it in. My question is, for those that are small chested, are strapless dresses (with possibly a sweetheart neckline) going to require a ton of alterations and/or look awful? Will there be problems holding the dress up even if they're altered to fit snugly/correctly at the top? I don't want them to have to worry about having to pull their dresses up constantly on the day of, but a lot of the dresses they're interested in have this style neckline. I guess they could always add straps...? Do most BM dresses usually need alterations? I thought I got pretty lucky, as the BM dresses I've had to wear so far have fit well enough to where I haven't needed to get them altered. TIA!