If you want custom skins to show for all clients conecting to your server, there are two ways to do it, easy way is to use Jafo's BotManager then recomile the skins, or this can be done manually as well. You will want to create a .u file that is pushed to clients and the textures/meshes etc. We used to do this when 2K4 first came out with success, problem becomes when there are many skins new clients spend a LONG time downloading all the files. Please note, Although botmanager can compile MOST skins, you will have problems with some.
You can find more info in this great post:
http://forums.beyondunreal.com/showthread.php?t=137460
Hope that helps.