This place even smells like an old t-shirt shop. We went in to look at the band t-shirts they have and got stuck in there for a while looking at belt buckles, patches, stickers, hats, marijuana paraphernalia; everything. The owners are quite helpful and will help you find exactly what you're looking for. A lot of their t-shirts and hoodies are imported from Europe, which gives the place an excellent selection of things you can't find in other places.
Charisma looks a little run-down from the front (it's even hard to find the entrance because there are no big signs) but once you find it, you're in for a treat. Great and original stickers and clothing. It's a cool, hidden gem of a shop in Kensington.