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I haven't, though going by the name, it's probably German. Posselt being the company name, Wäsche meaning lingerie in this context. I can see a few more vintage lingerie items listed on various sites with the same or a similar label. Probably not a "big" brand. Slips, nighties, robes, 60s, 70s roughly. I'm guessing yours is maybe a nightie or a house dress.