Canela Leather Huaraches

I buy a pair of huaraches nearly every year. I wear them out with daily use during spring and summer. These are the only shoes my feet feel comfortable in without socks. I wish I had a pair in every color.

Very cute, fit well, great color. The problem was they smelled like chemicals and even after letting them air out a couple days they still smelled so I had to return

How can I shrink leather? They are becoming flip flops as they stretch