I've never been happy with derbies that have heel slippage - it's harder to correct with insoles than boots. That seems like a lot. Either wear them with thick socks in the winter or consider finding your size
What are you asking?
"Can I buy these patterns and maybe have a tailor/factory produce some of them with a lot of time and money involved?" I guess.
"Can I buy clothing patterns and start a brand with no business knowledge and expect to be profitable?" No.