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57 flannels were worn at least twice.
The one flannel worn most often, was worn in the first 7 seasons.
Episode '4.21 - Luke Can See Her Face' and 'Summer' had the most flannels: 6.This page contains 360 images for the flannels alone. Loading might take a bit.
Only 33 flannels were worn once. Click to enlarge.
...which he only wore twice himself.
Although not really qualified as a flannel shirt, it's still a good one worn in season 1.
Luke: I'm not a very mysterious man, am I?
Lorelai: Well, the wardrobe is a bit of a head scratcher...