Black and white stripe/black Lululemon tank with inner bra size 4

This unusual blousy tank top has a fine black and white stripe with architectural black overstitching and a blousy black bottom with a shimmer. It gathers at the hem. The top is in very good pre-owned condition. No size tag so please check measurements. Size 4. Chest: 30” Under bust: 26” Hem: 38”