Holy Buckets, you lucky diva! I'm astounded! Good job!

Ebay will not allow you sell a high-end brand name right off the bat. You have a build a sellers status with 100% feedback for some pre-determined amount of time (and I don't know what that is). That is especially true for brands like LV, Gucci & the brand they are most wary of, Chanel. I believe this is to determine if you are a dealer in copycat fashion or actually have the real deal.

That said, you could always contact an eBay rep with detailed photos & dimensions of your B.Mackie, and feel out if this is a brand that they have red-flagged. I kind of doubt it..

The other thing to consider if you are selling to a vintage store is that the fact that you may get low-balled in regards to what you think the "value" of the piece is. You have to consider the buy low, sell high factor. The typical formula that I've seen is payout of 1/3 of the retail value. Some stores will payout a higher percentage but it depends on day, sometimes. They store will want to make money. If you feel you have to get the most high amount, I would consider consignment at a reputable consignment store in an urban area that gets lots of traffic/turnover. Since you are in Austin, I would woo the stores in the Dallas or Houston areas, where ladies have lots of events to go to and need gowns.

I'd be interested in knowing what you want to get for this piece. Just for fun. And also what if you consider this to be a wearable size.

Last but not least, Roxy, You live in Texas, the epi-center for Pageant Fun, and Bob Mackie is the KING of Pageant Fashion. Perhaps there is a Pageant organization where you can post the opportunity for sale.

Anyways, it's a happy problem & when the time comes for the sale, you'll be thrilled. Think of the return on your thrift store investment!

Well you can sell on facebook, craigslist, sign up with auction.
Let me know how it goes. May be I can help somehow.
you can sell on tribe in antique/vintage session