I've written about this here before, probably several times as I do tend to repeat myself, but I've been told that my Czech accent is pitch-perfect for a "Moravian Slovak". So I "pass" with my complexion and accent. The kicker is that the moravian slovaks are the Czech equivalent of our hillbillies/hayseeds/oakies (et. al.) so everyone in the big city treats me like a moron and speaks really slow and pronunced in small words so I can understand, but they never charged me American prices.