My husband like cashmere and silk blend and wear it often, but regard it as a spring/autumn sweater, rather than a winter one. I have brought him some summer silk sweaters, but always prefer 2 ply, because I know he will become hot and sticky in the heavier weight.
And it is more durable than a 100% cashmere. His sweaters gets hole in the elbows no time.
It rather depends on you and how you react to heat and how often you wear your sweaters. Share your story.