If you're familiar with Threadless, this t-shirt shop has a similar but smaller-scale vibe. On the hipster side, but with reasonable prices for their apparel. There were a couple "tourist" t-shirts (but still with a trendy flair) and a bunch of quirky/pop-art designs. I think the sizes do run small, but there is a room to try them on, so maybe try a couple sizes, including one larger than you normally wear. This type of shop was really unexpected for me to find in Porto, but I'm glad I did! read more