After talking to several much more experienced seamstresses than me, I have decided to make a corded petticoat. It will keep the proper shape of the Irish dress but give it a little shape at the bottom. I am using sisal clothsline rope and cotton muslin for the skirt. I will use binding tape for channels instead of sewing the channels from the skirt.
Basically what I'm doing is modifying the hoop skirt that I made but didn't use because it didn't look right. I'm going to put a few more channels in the bottom and thread the rope through.
So there's the next project. Oh, and thinking about it, I'm going to make a braided cord girdle for it. I'm going to make the cord with my lucet, in greeen, yellow and maybe beige. Then I'm going to braid them together. Sounds like fun.