Authentic Sizing Chart
Small     Medium      Large        XL      2XL     3XL     4XL
36            40              48           52        56        58        60
This is straight from www.nbastore.com

There is no such thing as size 38, 42, 44, 46, 50, and 54.So dont believe if someone says they are real!!!!
So if you see anyone with a jersey in 1 of those sizes than that jersey is FAKE!