QB you can get creative and buy some material like this Toughtek Neoprene non-slip fabric - Mini-Pique Texture cut and shape to fit your shoulder area use fabric glue or sew on....in the end it seems its just your wearing the wrong cloths for shooting a steel or ridgid plastic butt plate.
Quickest solution is one of these
Basics Cloth Shooting Coat. - Creedmoor Cloth Coats - World Famous Shooting Coats | Creedmoor Sports or these 10x jackets they are light weight and tough as nails. The one I got from a old shooter retired it in 1982! You can find them in many sizes if you look. Then there's the marine Corp jackets Military Logistics Mfg : Shooting Jacket
10x jacket http://www.google.com/imgres?imgurl...D600%26tbm%3Disch&itbs=1&sa=X&ved=0CDIQrQMwAw
Quickest solution is one of these
Basics Cloth Shooting Coat. - Creedmoor Cloth Coats - World Famous Shooting Coats | Creedmoor Sports or these 10x jackets they are light weight and tough as nails. The one I got from a old shooter retired it in 1982! You can find them in many sizes if you look. Then there's the marine Corp jackets Military Logistics Mfg : Shooting Jacket
10x jacket http://www.google.com/imgres?imgurl...D600%26tbm%3Disch&itbs=1&sa=X&ved=0CDIQrQMwAw