[Powerlord]

Any particular reason you need to know the slot number?

Hell, TF2 can't even get cosmetic items slots correct for its own internal functions, such as CTFPlayer::GetEntityForLoadoutSlot, which returns nothing for slots 7 or 10, which are cosmetic 1 and 3 respectively.

For reference, loadout slots are:

0 = Primary
1 = Secondary
2 = Melee
3 = Utility
4 = Building
5 = Unknown
6 = PDA2
7 = Misc
8 = Misc
9 = Action
10 = Misc
11 = Taunt
12 = Taunt
13 = Taunt
14 = Taunt
15 = Taunt
16 = Taunt
17 = Taunt
18 = Taunt

Note: This was taken from g_szLoadoutStringsForDisplay in server_srv.so a while back, so Valve may have given them better names since then.