Yeah, I inquired about why certain shirts aren't available in women's sizes. I suggest maybe leaving a note in your order about it wanting to be on a woman's fit instead (but make sure it's the size you want in women's, of course).
At least, that's what the cust. service rep told me. =/
I don't know about other shirts, but I guess they put up mens shirts first (probably higher demand), and either they should have already or will put up this design in womens sizes within the next few days.
I will only through WLF (that way it's licensed by Hasbro), and I will be giving them a poster-formatted file for this design, but I think for the time being they only randomly include a free poster along with your order, so you never know what you might get. That might change soon though, hopefully! Something I'll definitely ask about.