I'm giving up with Weatherbeeta and was thinking of trying a Horseware fly rug (as they generally fit him well). I like the look of the Mark Todd ones but not sure if they suit bigger build horses better?
My ISH is wearing Shires combo but its rubbing her rather large shoulders. I have just bought a Amigo Bug rug which fits better - we will see if the hair starts to grow back.
The Rambo Hoody might suit. I got one last year for my welshie - he's quite wide and it is covered him really well and never slipped. The ear holes mean the neck cover doesnt slip down the neck like most do.
Unfortunately my boy trashed his but then he has actual sweet itch and is now in a Boett so as long as yours isnt too boisterous it should be fine.