Underware in same packs and labeled the same size are not!

Don't ever buy the woman's bikini underware packed in three's with the Friends or Mickey Mouse brands on! Each pack is R160 and although labeled as all the same size and cut when you come to try it on at home each pair differs in size and cut. When you put one pair on top of another one is clearly smaller than the other but also labeled the same size. Unfortunately you can't return underware so this is a waste of R320 for me. Sadly I trusted a brand that I have known for many years, but this is ridiculous!