You've got to look at four probabilities:
X, probability someone wears a geeky watch with exposed toggles and electronics;
Y, probability someone wears military-style clothing;
Z, probability someone wears oversized shoes;
W, probability someone is a terrorist.
I'm betting X * Y * Z is still much larger than W.
You forgot to add investigation; that would be really easy checking his website and seeing that he has been an artist for many years and that he always dress wierd.
And lets not forget that they could have easily break his shoes and see if he was actually hiding something inside those.
I'm betting X * Y * Z is still much larger than W.