I bought a Shires one a while ago for a broodmare I had on loan. It came up quite small for her, tbh, and although I had it professionally washed, it distorted.
S
I love mine.............and only buy shires rugs, I agree that they are not generous in size but all my horses live out in them and they never slip, rub or leak!!
mine wore one all winter (with a non-combo underneath)
the neck isn't quite fitted enough IMO and then wind just blows underneath it but other than that, very good. never had a leak it's 10 year life!