Plugin in original post updated to version 1.2. Unusual Effects and Paint were added in this version at the request of H4rry so it now requires TF2Attributes (link in original post).
Format for !wearit command:
!wearit <item1>, <item2>, <item3>, <item4>, <item5>, <unusual effect #>, <paint #>
Unusual numbers are currently: 1-176
Paint numbers are currently: 1-29