I’ve made many of these corsets based on Drea Leed’s Corset Pattern Generator. I ALWAYS make them with boned tabs, since without, I find they dig into my hips and hurt something terrible.
I’ve made them single, double and triple layer, using canvas or coutil as a main layer, sometimes with a cotton lining, or a fancy brocade as an outer layer. Sometimes I’d just use two layers of the main layer and sew channels into that, other times I’d use double fold bias tape as boning channels on a single layer for more breathe-ability. I’ve used flat steel, spring steel, and zip ties for boning. For the Renaissance style, I prefer flat steel for a smoother, straighter line.
I have also used Drea’s instructions to create my own “effigy corset” seen in black below.