My other shopping method is to buy the one colour that there is the most of on the rack (when I'm not buying every colour available that is), cause usually that means that not as many people have that particular one. When they zig, you zag!
I'm totally in love with all of the button up plaid shirts, aren't you? I love how many of them have ruffles along the buttons in the front as well. I have to go and buy some, yes, some......one in every colour!