Yantha Nataya rare y2k vintage party wedding ivory NWOT 1920s Downton Abbey

Yantha Nataya rare y2k vintage party wedding ivory NWOT 1920s Downton Abbey Nataya brand tried out another name early on, this is store dead stock and is the same company. Size small/medium pull over style. Slip is attached at shoulders but can be easily detached. Measures 38,32, 40. Allow for breathing room for a vintage look. Tag says medium and 100% rayon, but my professional opinion is it’s cotton, rayon, and nylon. This dress is brand new from dead store stock and was never worn except maybe for a fashion show as it’s missing its tags. There is a matching jacket listed as well.