Sewing pattern for binder?

[Nuuni]

Trying to learn more about sewing, so I am trying to make useful things - My husband is having fit problems with binders, in part because he is kind've huge, so I would like to try to fit one for him. Are there any sewing patterns for binders floating around?

[ashisaboy]

http://imgur.com/a/amYMu
Kinda a messy drawing that requires a bit of math but this is the binder I made myself (I'm a DD) and I'm flat wearing it