In the past i have tried it both ways. If i were you i would sell the dealer the holsters, that way you have your money up front and you can use it to buy more leather or what ever.
If you do consignment you have your holsters and your money tied up. Maybe for a few days but it could be a few months or longer. Plus you need to make sure their is a understanding on what happens if something is stolen. Who's going to be out the money you are the dealer ? That's why i suggest selling and getting your money on deliveryif something happens to the holsters it's their problem. Plus they will try harder to sell something that's theirs.