English translation: cool wool (summer-weight wool, light wool)
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Explanation: As far as I know, at one point "Cool Wool" was a registered trademark, but I think it has entered the language much the way the term "kleenex" has.
Here's an example (from the site listed below):
100% Worsted Wool 64" wide; "Cool Wool: tropical suiting for 3 season comfort; Beautiful drape, subtle herringbone weave does not show in photos.
More (second site listed below):
"Browns Own mens cool wool suit teamed up with a shirt and tie is our definition of style for the boys."
Here's yet another one:
"Italian Light Weight Cool Wool Shirting Fabric
Detail: It is wrinkle resistant, drapes well and luxuious softness. Light weight designer wool shirting."
Won't fit below so here's the URL: http://18.104.22.168/fabrics/fab_wool110.htm