These are UK measurements. Size 8 is equivalent to the U.S. size 6, size 12 is a U.S. size 10 and size 16 is a U.S. size 14.
Via Babble

These are UK measurements. Size 8 is equivalent to the U.S. size 6, size 12 is a U.S. size 10 and size 16 is a U.S. size 14.

Via Babble

NIGHTNIGHT by DEDDY