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.
Brie Larson's sports bra and lilac purple ribbed cropped top and leggings