1937 Sears Christmas Book. 90% cotton, 10% wool full body long underwear. $2.49 per three suits ($0.83 each).

From Amazon: here 100% cotton full body long underwear. $18.70 minimum per each.

I will happily take the arbitrage from buying $0.83 full body long underwear suits and reselling them for $18.70. 2253% gross return is rather more than acceptable.