Super warm quater sheet recommendations please?

I've got an amigo that attaches round the saddle and has a 200gm liner that will be for sale if anyone wants it. Very similar to their competition sheet in style. I had it for the 16.1hh chunky TB.
 
The PSSM pony had one of the rambo fleeces as its super thick and warm, and then either relective or waterproof sheet over the top for hacking.
 
I have just purchased a thermatex but I’m interested in the fit of the Kentucky ones. My horse is 6’9 in most rugs, I ordered a Kentucky cooler and it’s massively short on him.

I use the medium on my 14.2 & it’s slightly big, I’m also a Kentucky retailer & I’d recommend the full, they come up largeish if that’s any help
 
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