This is not true [1], it's a line from the movie My Big Fat Greek Wedding which doesn't even mention the etymology of "winter": "Ah, of course! Kimono is come from the Greek word cheimonas which is mean winter. So what do you wear in the wintertime to stay warm? A robe."

[1] https://books.google.co.nz/books?id=QQovEeLHVl0C&pg=PA115&lp...

Kimono is 着物 which transliterates to “wear-thing.” It’s the word for clothes, not just the traditional robes, and it’s not etymologically related to a word for Winter in any language.

Japanese has many -mono words based on verbs: tabemono 食べ物 is food (eat-thing), nomimono 飲み物 is a beverage (drink-thing), tatemono 建物 is a building (build-thing), kudamono 果物 is fruit (reward-thing; the Japanese word for “to fruit” being related to the verb for achieving, similar to English “come to fruition”).