Some basic rules on dressing that i use for myself:
1.First you should dress in a way that fit wif your ambiance / places you frequent.
2.You should always use what makes you fell confortable, for example dont wear polo if you think that dont fits on you just because it fits on the other guy.
3.People should not look at you because what you are wearing they should look the you and your clothes like one. (thats why I dont realy like peacoking)
When I go to field I like to wear a white shirt wif some "diferent details", Jeans, black leather belt sometimes a coat and mens jewlery ( alot of mens jewelery) like rings, bracelets, watch...
After I post some images of how I like to dress ( 1 image is more than a 1000 words
)Hope to Help - (sorry about the gramatical mistakes
)J.Fox