I will be spending two weeks in Greece in July (read: hot and crowded). My time will be split between Athens and two islands. I have several soccer jerseys (of various European clubs and countries, plus the US) which are fantastic in hot weather (extremely light, keep you dry, etc), however I'm wondering if I would be too dressed-down. We won't be going to any fancy events -- usually we walk around town during the day, and find some place interesting for dinner. I may bring one or two polo shirts, possibly just for the evenings.
Any suggestions/warnings?