The last graphic craze consisted of animals and funny (or not so funny) sayings. Now the tide has turned to brand logo's and vintage band tee's.
Personally, I think the brand name/logo won't last very long- you're like a walking advertisement and that's just not a good look. Band tee's on the other hand are the ultimate cool girl addition, an effortless statement (which is the best kind, duh).
Ebay, Etsy, and vintage shops are your best bet for these- happy hunting!
'The Who' tee: Etsy ( featured on my Insta @ReadytoWard )