Dear customer, US M(Tag size XL) means that it's Medium size for United States Size and XL size for Asian Size. If you usually wear XL for US size, please choose US XL(Tag size 3XL).

What does P size mean?

Petite: This is not only for shorter women, but for women who are smaller in general. ... Sizes are often designated with a P at the end, such as 4P (size 4 petite).

What size is 100 on Amazon?

Size 70 suit for 8-16.5lb baby; Size 80 suit for 16.5-21lb; Size 90 suit for 21-24lb; Size 100 suit for 24-30lb kid.