Blanc Du Nil SET of T5 Womens Sleeveless White Blouse w T2 Flowing Pants

Blanc Du Nil SET of T5 Womens Sleeveless White Blouse w T2 Flowing Pants Sleeveless top is size T5 - measurements are 20.5" underarm to underarm; 25.5" back bottom collar to bottom hem. 100% cotton. This was only worn maybe twice, however due to being in storage, there is yellowing on the underarms and the neck area. I haven't tried cleaning. Pants are size T2 - measurements are 25" waist, stretching to about 30" comfortably; 27" inseam. 100% cotton. Same yellowing has occurred to pants as shown. Didn't try treating these either. From a clean, smoke free home.