You don't really need to run it through the Tailor to get it to fit. The way you're doing it (no mannikin or anything), you could probably get similar results just by scaling the clothing or the figure slightly. V2 and V3 are similar enough that the clothing fits pretty well "out of the box." There will be some poke-through, but you can fix it with scaling and turning parts invisible.

Some people can fit clothing you'd never think would fit this way. It doesn't work well for animation, but for stills, it usually works pretty well.

PoserFashion.net has great stuff, but no saloon girls that I can recall.