The Duquesne University Tamburitzans, who perform Eastern European folk dances and songs, occasionally play the Polish bagpipe. As I remember, the pipe, chanter and drones were made of brass, while the large, square bag was covered with velvet. (It looked like a cross between a sopha cushion and a plumbing fixture.)
If the Tammies come your way, be sure to go and see them. They're amazing. I suspect If you got in touch with one of their directors, they'd be glad to tell you about any and all eastern European bagpipes.