Workout or yoga tank top.

Excellent movable fabric. So stretchy and comfortable. No built in bra. The back has awesome stretch seams to provide optimal movement. Not sure of brand. There is no tag inside but best guess is this fits M best. But I wear small and mediums and it was great for me too! I’m not busty and it was perfect! I also wore pregnant and worked great. It’s super flexible so is versatile. Slight pilling from wash and wear but tons of life left