Acceptable:
Blue, any shade
Pale pink
White if you're a massive penoid
Light grey for utilitarians

Unnacceptable:
Black, without a jacket = barman, with a jacket = Alan Pardews Used Autos salesman
Green/Red, just doesn't happen does it
Yellows/Orange/Purples, urgh.
Paisley/patterned Top Geary ones, urgh.