About character skins

hello
1st, I use .dts character mesh with 5-6 UV maps, like, body, underware, head, hands etc.
how can i change more of 1 skins at once?
the command is id.setSkinName("xx"); and limited to one change in the time...

2nd, The appearance or disappearance of a mesh on a character updates only to any player login into the game after the change. Existing players do not see the mesh change.

Any idea? thanks for your time :)