I am wondering the same thing as may_bizzare. Can we make one 1908 transitional and one for the Geometry? Two entries or do we use the 1908 pattern with geometry ideas?

You can make a garment that fits one or both of the prompts (so yes, you could make two garments - one 1908 and one Geometry-themed). The sew-along will be for the 1908 corset, whether or not you want to enter it in the contest, include geometric themes, or just make a new corset.