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1.
What Lumberjacks and poor people in the early 1990's wore.

Flannel check shirt often worn over a t-shirt, with jeans and rigger boots, fake Caterpillar boots or Gola plimsoles.
Yanks call it plaid
James: Dude, your shirt is the same material as my dog's blanket. ergo that is a Dog Blanket Shirt.

Alex: I dont care what you say about my shirt, I like it personally.
Alex's boss: You didn't pay for that shit you're wearing did you?

For further examples of Dog Blanket Shirts look for Dom's Dog Blanket Shirt Calendar from the BBC Radio 1 Chris Moyles Show.
by Wordsmith Ru February 05, 2009