I would use a pant pattern as a base and cut out the sections he has cut out g and using the (buckle?) he has in the front to act as the waistband, you could also tack it to the pants you're using under the chaps
Anime USA 2015...Halloween!
Steven Universe- Rose Quartz Gown version
Evangelion- Asuka Langley Soryu Yellow Sunddress
Magic Night Raye Earth- Ferio Yellow Shirt Version
Yuri Kuma Arashi- Kureha Bear Form
Yuri Kuma Arashi- Kureha OR Lulu School Outfit
Artist's Alley Hopeful....We'll See
Awesome Con 2016
Deadpool/X-men Comics- Siryn...not sure which version yet...
DC Comics- Raven Either Teen Titans or Original Comics version....