For my corset, I'm using a resized pattern from AnachronismInAction on Etsy. In terms of fabric, I'll be using a heavyweight polished cotton for the outer layer, bull denim for the strength layer, and quilting cotton for the lining. 1840s corsets don't strictly need a lining, so I could totally use the bull denim layer as a lining if I wanted to. However, the fabric I'm using for a lining is something that I've been saving for a special project, and I really want to use it for this corset.
If you don't sew, you're probably wondering what bull denim is. Essentially, it's just like regular denim, except it's woven from 100% cotton and it has minimal stretch. In other words, it's perfect for corsetry. I accidentally bought the wrong weight of polished cotton (which is what I get for not fully reading the Etsy listing), but it actually feels okay with the other fabrics, so I'm going to use it anyways. It's not quite a heavy as the bull denim, but it's thicker than the quilting cotton (obviously). This corset pattern has minimal boning, so I think having two layers of heavyweight fabric will actually be beneficial. My only worry is that it may be too insulating to wear in the summer, but I plan to wear this costume in the fall for Halloween, so for that time of year insulation would actually be helpful, especially for a corset where it can keep your core warmer!
This patttern also calls for quilting to be done on certain sections of the body panels, but I'm currently on the fence about whether or not I plan to actually do that. Again, I don't want too much insulation, and also I don't think it would really offer much structural benefit. I may just do some quilting stitches but forgo the batting.