Plaid was what they put in the racing cars of that era so it was a natural to put in a gullwing. Did it have racing history? I am guessing if it sold for $2M it did.
Complaining about plaid seats in a gullwing is about like complaining that a georgeous woman leaves cracker crumbs in the bed!
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.

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..I also have a 427 Cobra replica with an aluminum chassis.