This mod allows you to change your skin while in game for now the mod is for SSP but I hope it will be for SMP soon.

the mod can be found here.
305687-15-01revive-button-switch-skins-in-game/page__p__4456942#entry4456942" target="_blank" rel="nofollow">minecraftforum.net/topic/305687-15-01revive-button-switch-skins-in-game/page__p__4456942#entry4456942

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