Brie Larson Instagrammed THIS photo.

She is wearing a Calvin Klein sports bra, possibly the Calvin Klein Modern Cotton Bralette.
Her purple 2 piece look is the Missguided lilac co ord rib zip up knitted top and Lilac Co Ord Rib Knit Leggings.
#BrieLarson #sportsbra #croptop #croppedtop #croppedjacket #leggings #athleisure #loungewear #CalvinKlein #Missguided