"Sometimes things that are not true are included in Wikipedia. While at first glance that may appear like a very great problem for Wikipedia, in reality is it not. In fact, it's a good thing." - Wikipedia.
I think it might be the Musée des 18 Jours at Pipaix in Belgium. Never heard of it before. A private collection, and clearly an impressive one. Sixty uniforms displayed on mannequins. No website, but some photos here
"Sometimes things that are not true are included in Wikipedia. While at first glance that may appear like a very great problem for Wikipedia, in reality is it not. In fact, it's a good thing." - Wikipedia.