These vests are lovely, the shoulders are plenty wide enough to hide any bra straps, the armholes are cut generously but still come up high enough to hide underwear and also smooths out the transition from bra to flesh, the material is supportive yet incredibly comfortable, the vests wash easily and dry in no time without any loss of colour.
I bought the long versions even though I'm only 5' 4" as I like them covering my bottom and these do the trick perfectly!

Received this today, and wore tonight to go out to dinner. First thoughts were this might be a mistake, as it was pretty snug when putting on. Couldn't have been more wrong! It was so comfortable.
Even now, full to bursting, it is still comfy but supporting. I'll get a lot of wear from this.