It's a very nice top but i'd recommend to size up if you wanna wear it with bra. And even without bra it's a bit tight for me , i always wear S. Fabric is not stretchy, zipper is a bit hard to close but anyway top looks rather pretty, just size it up;)

Fabulous top! Great fit, the lace at the back let’s you adjust the size to fit just right to give you support without cutting in.

It broke the first time I put it on, the zip also seems rather dodgy and stiff, normally love NR clothes but I'd give this one a miss if I was you.