ADIDAS training pullover Olympic Bahamas jacket USA size 8 ?

this is a genuine Adidas Olympic committee Bahamas pullover training jacket this is a UK size 12 which is a USA size 8 I'm kind of thinking this is a Junior's but it is on a size four model mannequin .. please ask questions before you purchase so that you know that it fits you properly. shoulder to rest is 26 in pit to pit is 17.