I have way too many t-shirts already, so that's not something I'm planning on buying

I like having, for instance, my wallet in my backpocket. If I had it in a jacket, I'd hang the jacket somewhere and forget about it. I don't hang away my pants/kilts while out and about.

I usually carry my wallet, my cellphone, my keychain, my buspass and a lighter. I need an assortment of different pockets to put them in, and I prefer it the jeans style of having a back pocket for the wallet, and frontpockets for the rest.