So, you have the suspenders clipped to the back of the jacket and between the legs. Are you clipping onto the front of the saddle or front of jacket?I had the same problem with my jacket getting pushed up so I cut off the leg straps a belt on my flex and added suspenders. Problem solved, now my coat stays down and when I stand up the saddle automatically positions itself right were I need it.
I will post a pic when I get a chance. I have dewalt suspenders attached to my saddle and my Sitka jacket under neath. Works great cause the suspenders keep the coat from bunching up and when I put my hands in the muff below my bridge I can keep everything pulled down. The problem with the flex was that both the leg straps and belt prevented me from pulling my coat down. I regularly hunt in temps below freezing as this has worked well for me. Also I never liked the belt for the walk in because the saddle constantly wanted to fall down. Suspenders also solved this problemSo, you have the suspenders clipped to the back of the jacket and between the legs. Are you clipping onto the front of the saddle or front of jacket?
The other day I noted on a FB post that it's only a matter of time before someone develops a saddle specific line of clothing. If I knew a good tailor at Rocky, UA, Sitka, etc... I'd tell them what to do.