Partial Clip: The Strip Clip
You can also take this clip one step further, clipping a large triangle from his neck to his flank. You’ll remove all the hair under his belly this way, plus you’ll trim hair from the lower part of his shoulder, as well.
This clip leaves hair everywhere a horse needs it most—along his back, flanks, head and upper neck. Your horse would probably do nicely and continue to live outdoors with just one medium weight stable (for indoors) or turnout blanket to protect his naked areas.