Start collecting all those odd gloves you see in the gutter at the side of the road, stuck on fence posts etc and eventually, you'll have a good few pairs.
Start small, selling them on e-bay, and then open a chain of shops. You could offer an exchange service where people swap an old odd glove for another odd glove to match one they've had kicking round for ages (nobody likes to throw away a perfectly good odd glove), and you could even offer a
ransom reward scheme where people pay you a nominal fee to return an odd glove that they've lost.
There are plenty of other associated revenue scheme - offering mismatched pairs of similarly coloured, but different sized gloves to 'Beadles', or single gloves to children's TV presenters.
Hell, it could be huge... You could even line-extend into socks...
Hope this helps.