Original post here. This image was researched by Bacchus at ErosBlog as part of the “Γ commission.” It was originally published at Hedonix as “Γ 013 – Steampunk Corsetry.” Here is Bacchus’s research:

According to a Tumblr post by Eve The Bisexual, the corsets in this photo are

from Dark Garden corsetry in San Francisco… The outfits shown here are from their Edwardian Ball 2013 collection, which you can see more of in their gallery.

Dark Garden Corsetry and Couture does indeed have an unlinkable gallery on this page which is labeled “Edwardian Ball 2013” and which features some of the same models and costumes, although not this particular three-model photo. They say “We were lucky enough to have Joel Aron photograph the collection at a beautiful location, Salle Pianos in San Francisco.” Joel Aron’s website is here and includes another gallery featuring these same models and corsetry.