Question about Unisex Mizuno Fleece sweat pants?

so i'm getting the mizuno unisex fleece sweat pants and i was wondering since mizuno stuff is always small if a size XS is small enough for me i'm 4'10 and i'm not like SKINNY i have an athletic build like a gymnast so i can fit in SUPER SKINNY pants or if i should get an XXS which you cant order but since i'm buying it from a specific supplier i think i can get that size..maybe. thanks