What's considered excentric changes over time. An 18th century dandy might fit right into polite early 20th century society for example.
And if you were to walk around today in a Roman style toga you'd be considered more than a little bit excentric (outside an SCA meeting at least) while in Rome 2000 years ago you'd have been wearing the height of fashion.
Myself, I prefer to not wear shoes if I can avoid it. People don't seem to mind but you get some weird looks (and questions if you're not cold) when temperatures drop to below 25C :)
Yet in the 1960s and early '70s noone thought twice about it, and in many parts of the world it's quite normal (Australia, Hawaii, South Africa, parts of the US, and of course most of Africa and large parts of Asia).
To quote one author "2/5 of the population take off their shoes whenever they can, while 3/5 suffer in silence"...