Consider: Naked D&D.
Okay but ACTUALLY monks, barbarians, wizards, and sorcerers don't wear armor by default, and druids can wear armor but thematically it'd be appropriate for them to be nude as well, so you could actually have a balanced party composition without any party member wearing anything, although you would have to have the druid spend a lot of time wildshaped or perhaps using mage armor/barkskin, or alternatively if you need a healer but don't want the druid to handle that duty have the sorcerer choose the divine soul subclass so that [several paragraphs of irrelevant D&D rules nerding out removed]