There is actually a magnificent Joker (licensed) tailcoat pattern from Simplicity right now. Start there.
Alternately, there is a women's tuxedo pattern from Burda...but Burda patterns are EXPERT ONLY.
"Better fitted to a woman's body" doesn't mean much. It needs to be fit to YOU, not to a generic idea of a female. If you're curvy and hourglass-shaped and/or are wearing a corset or other shaping garments to bump up your curves, the tailcoat jacket will have to be fit to those curves. This may mean fooling around with the shaping darts front and back, as well as the side seams (if there are any), but that's far, far easier than adding shaping darts and seams to a men's pattern meant to fit a man's boxy shape. Using a men's pattern like the Joker pattern isn't impossible, you just have to be aware of where you're tweaking seams to fit your body better.
Founder and President, Madison Area Costuming Society, a chapter of the International Costumer's Guild
Strange Land Costuming - www.strangelandcostumes.com