These kind of fancy vintage nightgowns are hard to find here in Kansas.  I think they are beautiful and some of them fetch some great prices!  Brand name "Lucie Ann" seems to sell well, and buyers like the Sweep (which is the hem of the garment being wide and "sweeping") oh and lace.. buyers like lace.  I'm pretty sure it's hard to take photos of these gowns.. but I find all the "stuff in the background in some of these photos really distracting.

Vintage Lucie Ann NWT Magnificent black peignoir nightgown robe set lingerie  SOLD 1249.00 by eBay Seller the_material_girl  Check it out HERE 

Vintage Glamorous Peach Olga Full Sweeping Nylon Nightgown Sz L SOLD $475.50 by eBay Seller renee-goodies Check it out HERE 

Luxury! Vintage French Silk Chiffon Satin and Calais Lace Nightgown handmade! SOLD 400.00 by eBay Seller atelier900 Check it out HERE 

Vintage Lingerie Nylon Lace Bra Area Satin Slip Negligee Long Sweep Nightgown SOLD $361.50 by eBay seller SecretBetweenUs  Check it out HERE 

Vintage Lucie Ann Robe or Gown Rare Sweep Nightgown Pink Lingerie Lace Couture Sold $349.99 by eBay Seller DixieDallas  Check it out HERE