I ordered a S/M, being a 5'6 tall woman, about 140 lbs. It fit how I thought it would, give or take, except I felt the bottom of the dress went fell at sort of an awkward length. It felt like tshirt material, not necessarily soft, but it was not scratchy or stiff. The dress was not see through, though it drops down a bit in the back and sides, to avoid showing bra I wear a bandeau and it looks quite nice. (I was not in the review pictures) It has nice twisted shoulder straps. Not as neon as in the seller picture, though it's perfectly pastel enough to be equally as aesthetic.
I got this dress a 4 out of 5 stars for one reason and that reason is because the colors weren't as bright as the ones in the picture, but other than that this is definitely a great buy! I normally wear a size medium so I got size S/M it does fit true to size even if you are big chested it does stretch. It's like a T-shirt material= SUPER COMFY! not really transparent but it does fit fitted. Got here in a reasonable time as well, would recommend someone getting this dress!