Q. May one wear a winter hood and on top of it a black hat during Shabbos?
A. If they fit well and there is no concern that one may remove them, they could be worn when needed due to the prevailing cold climate during Shabbos, even when in places where one does not carry.
Rabbi A. Bartfeld as revised by Horav Dovid Pam, Horav Aharon Miller and Horav Chanoch Ehrentreu Shlit'a