My first question would be whether you want a waist reduction or not. While the Laughing Moon patterns are fabulous for period corsets, they're designed as traditional compression garments with steel boning which should reduce the waist by several inches. If you're looking for something that simply has a corset-like look, but you don't really need the reduction, I actually wouldn't recommend Laughing Moon or any of the
corset patterns on the market. It sounds like you may be looking for something more like a corselet, which gives the look and smoothness of a corset, but isn't going to cinch you in several inches. Especially with the underbust style you're interested in, I would instead recommend Truly Victorian's TV492 (Victorian Corselets):
http://trulyvictorian.com/catalog/492.html