Right now I'd have to say it's my madras Engineered Garments shirt. It's bright, the cut is pretty nuts (the front buttons only go down to above the belly button, which I'm sure serves some historical purpose?), but it layers great and is pretty darn unusual for a madras. It'll probably change next week, but right now it's my favorite article of clothing.
Gotta thank Fok for introducing me to engineered garments. Something about obsolete clothing manufacturing methods (upside-down pockets, triple stitched seams) is very appealing.