Love this piece so so much and it’s so flattering!! Body is very slightly sheer and cups are double lined with underwire. side cut outs with adjustable ties; yes it may show your underwear straps. no stretch has zipper in the back. In lightly used condition, has very faint marks near the pit but I managed to lighten them so they’re barely visible! RTP $225 😵 Size XS fits true but please refer to their size chart added in the last slide!