This dress is so gorgeous, well-made, and very comfortable! I purchased it to wear to a party. There is nothing about this dress that's ill-fitting, rough/scratchy, or uncomfortable. The outer layer is very light and flowy. The inner layer is still lightweight, but more silky. The cups are also lined in this same silky material. I don't know that I'd be able to wear a bra with it, as it does show a bit of side boob. But, the cups feel somewhat supportive. I think as long as you don't have saggy bags, you could easily get by going braless with maybe just some silicone petals to avoid any headlight issues. For size reference, I purchased this dress in a size 6. I am 5'4\\\" and 140-ish pounds. My measurements are 37\\\" bust and 29.5\\\" underbust (34D, fake boobs.) 26.5\\\" waist, 38\\\" hips. I always wear size Medium in tops, and 4/6/28\\\" bottoms, depending on the brand. So, I'd say this dress runs fairly true to size, or perhaps a teensy but small. If you are between sizes, I'd maybe size up, as I can usually wear a size 4 in most women's dresses. This dress is pretty long, however. Great dress --- BUY IT! It would be awesome for bridesmaids, or for a female to wear as a wedding guest, prom, bridal shower, etc.