As with all my models, it's all experimental. I have found a strength of 0.7-0.9 is best with a cfg of 1.4-1.6
You can add the color of the leather into your prompt along with a preference for 1 or 2 buckles, in your prompt. eg. "has an afo leg brace on one leg, the brace has a black leather strap with 2 buckles"
You can choose left, right or both legs. if will work most of the time.
For a more vintage look I like to use alongside this lora https://civitai.com/models/3012015/candid-amateur-iphone-moss-image-or-qwen-21?modelVersionId=3418446 with a strength of 0.4.
Please post your images, I could do with the Buzz