Longs have different rarities then shorts but the colors are in the same "order". (From most desired to least desired)
Orange and green are considered "bad"
Yellow and Pink are considered "okay"
Blue, red, and purple are considered "good"
and black is considered "best"
same goes for short collars and wrists.
Pink longs can be traded for (at best)
Two good shorts (and possibly add, depending on the player.)
Hope this helps : )
(also they're Wikis on how much spikes are worth!! They're on Popular pages, most visited articles.)