Yeah, I just tend to bind my costume changes with emotes to my numpad buttons. The code is typically:
/bind numpad# "cc_e "
example
/bind numpad1 "cc_e 1 ccCast"
Numpad 1 will then use the Cast Emote when selecting my second slot costume (Since they start at slot 0)
/bind numpad# "cc_e "
example
/bind numpad1 "cc_e 1 ccCast"
Numpad 1 will then use the Cast Emote when selecting my second slot costume (Since they start at slot 0)