Methods, computer program products, and systems are presented. The method computer program products, and systems can include, for instance: obtaining radio signal encoded data from one or more radio signal emitting device disposed on one or more fabric item used for thermal insulation by a user; performing data processing using an obtained environmental temperature of the user and one or more thermal characteristic, wherein the one or more thermal characteristic is determined using the radio signal encoded data; and providing one or more output based on the data processing.