This struck me as 30's at first but after a little more research I'm now at 40's possibly very early 50's. Would anyone know when these types of gowns with the swag across the front were most popular? Fortunately, this has a couple of tags so maybe that will help pin it down if anyone is familiar with Mindelle. Also- I'm pretty sure it's taffeta but would welcome any knowledgeable thoughts on this. I was kind of hoping it wasn't taffeta because I dread trying to wash it, lol.