Too hot and heavy depends on where you live and how warm you keep your house. I live in western Washington with cool wet winters and slightly less cool and wet summers. We keep our house heated in the low 60s during the cooler months so here I think it would be just about right. I'm in the process of gathering old men's flannel shirts for a quilt and I plan to make it like you describe. If you heat your house into the mid or high 70s, or live in a warmer climate, it could be on the warm side.
Rodney