I bought these separately at the same store last winter. Images 2-11 show the product information. All are 100% cotton, and half are definitely organic cotton. I've gathered only the undershirts. All 8 items in the first image are the products. Rompers are also sold separately. I only used these during the newborn period. There are no noticeable stains, and they are fluffy, including the organic cotton, so they seem like they can still be used. I washed them in a laundry net, only with baby clothes. Would these be suitable to wear under clothes this winter? #Twins #Newborn #Rompers #Undershirts #Bundle