Wiktionary
a. (context of clothing English) Of relatively light weight, intended for use in warm summers.
Usage examples of "summerweight".
He tried to raise himself on his elbow and subsided up to his chin among silky sheets and softly spun summerweight blankets.
Jim already had piled up a pair of high-quality summerweight sleeping bags with air-mattress liners, a Coleman lantern with a can of fuel, a sizable Thermos ice chest, two big flashlights, packages of batteries for the flashes, and a few other items.
The sudden change of temperature as the heated air of the cabin rushed out and was replaced by the Arctic air above the floe seemed to knife through the protection of the anti-G suit as if it had been made of thin summerweight cotton.
It’s Akron and it’s a blue summer dusk and kids are playing kick-the-can at one end of Stossy Avenue and stickball at the other and Brautigan stands on the corner in a summerweight suit, stands by the pole with the white stripe painted on it, the white stripe that means the bus stops here.