but WHAT IS THIS?!
The Advance company didn't date their patterns (bad company, bad company!) but from looking at the location of the logo and the font style, this was issued somewhere between 1947 and 1959. Doesn't look it though, does it?
Since this really puzzled me I did some research. First thing I found was that since the Advance company's first pattern was #1000, the fact that this number is so small (#700) implies that it was part of a special series or a promotion. After a look on the Vintage Pattern Wiki, I found that the next pattern #701 was a clown costume for adults, #707 was the same one for children and (dealbreaker!) #709 was a Peter Pan costume, so I am quite sure that this one was meant as a costume. Well, I sure hope so!
Because this pattern is so far from 1940-50s style as you can get. The ruffled banded collar, leg-of-mutton sleeves, faux weskit with basque waist, ruffled overskirt and simulated bustle detailing the back could be fine as individual elements, but together? The only thing that seems to be missing is a true back bustle. It looks a lot like an Edwardian restyling to me, but I'm not sure. Anybody?
Available both at Woodland Farms Antiques and Carynification's Etsy shop....if you dare.
* Pattern dating information from Cemetarian's site.