Hi,
I like your project very much as I like to work with leather. I have previous experience in leather jacket, men and women as I worked in EU brand which has this items in it's assortment.
I am expert in Adobe Illustrator and Photoshop so can draw what ever you wish.
I can provide illustration, technical sketch, English description, measurements and anything else you need.
Since your project need 4 designs I consider fair price would be 200 usd.
Pls advice more details about your project, I would be happy to work on it.
Mariana