I dabbled once with a few retail products, mostly custom magnets and pins made with brass or nickel rims. My big draw was that I could make them on the spot because I dragged my equipment to shows.
I learned pretty quickly that (potential) customers really only care about products that represent a specific interest.
For example... at a juried arts fair, the woman next to me was crazy-busy selling metal hair clips. Nothing special, I thought. She told me she bought barrette blanks from China and spot-tacked? —glued? metal charms to them that represented things like nursing, teaching, cats, etc. People came by asking, "Do you have anything for _____?" and she usually did. The vast majority were purchased for gifts. She also said she advertised nurse-themed clips in a nursing publication and sold a LOT that way.
You're not necessarily going to sell something just because it's made from leather; leather is almost secondary. People seek out things that appeal to their hobbies or personalities or professions, etc. —leather might just be a bonus.
If I ever attempt this again, I will cater specifically to interest-themed events (car shows, or marching band competitions, or... whatever) and only have products that appeal specifically to that.
Your mileage may vary.