I asked the Polish Embassy on Twitter. By the way, do you follow them? You should.
Here's what they found out. Apparently, quite a few others have been inquiring about the dresses.
The article on RFM24 is in Polish. You can use Google Translate to get the gist of the information. The dress is designed by Poland's Ranita Sobańska.
I decided to check on the 4F website, since that is the company who made the uniforms. They have the dress!
The price is 249PLN, which converts to roughly $75USD. However, it looks like according to their website, they don't offer shipping to the USA at this time. I will find out and let you know.
After all, I also want one for myself.
Disclaimer: No compensation in any way has been received for this post. I was not asked to promote anything in any way. I just really love that dress!