I have done this. As a trial attorney I need an extensive business wardrobe. I exhausted the possibilities for women's blazers pretty quickly. Most are too short for me; I am a bit long in the torso for a girl my size.
I went back to my closet and grabbed a couple of my men's blazers and sport coats, threw them on over a mini skirt and I loved the look. And men's sport coats feature a much wider variety of patterned fabrics than women's blazers do.
One problem was, after two years on hormones, I was swimming in my old sport coats. So I found an alterations tailor and went to work. I had to have them taken in at the shoulders and waist, have the sleeves reduced in diameter, and have the bottoms hemmed up about two inches. I also jazzed up a couple of them by swapping out the buttons for new ones made of mother of pearl or of acrylic in bright colors. After all the mods, they look cute and feminine but serious and business like. And interestingly, the male cuts and fabrics seem to heighten my femininity.
So my old sport coats and some suit coats are repurposed as boyfriend jackets.
One word of advice: Dont waste your money altering cheap clothing. You will just give yourself and your tailor a headache. Doing this is not cheap; I spend anywhere from $60 to $160 per jacket, but on a jacket that retailed for $600 new, believe me it's worth it. I started out with blazers and jackets from Brooks Brothers from my own admittedly extensive male wardrobe. Then I grabbed whatever else I could find at a deep enough discount to justify the tailoring costs. If you don't have quality menswear to work with, get some either from a place like Nordstrom Rack or Saks Off Fifth, or hit the thrift stores or evilBay. The good news is, when you have this much work done, you don't have to start with your exact size. I've found I can go an inch or two over and it won't matter because of all the tailoring I'm having done anyway.
Here's a link that I found when I was researching repurposing my old stuff:
https://verilymag.com/2014/12/how-to-thrift-an-oversized-coat-winter-trends-2014Hugs, Carly