hemming legs is *theoretically* easy, but a lot of pant legs aren't cut with perfectly straight legs. when bell bottoms and flares were super in again during the late 90s/early aughties, my grandma insisted on hemming my jeans & the flare basically disappeared even with the opposite, like fitted ankles, when you hem you change where the ankle was like... "designed" to be and now the calf part is the new ankle. it's weird. clothes designed for women are weird. when I'm not pregnant & I'm not dressed up for work, I live in jeggings & band tees. the band tees don't fit GREAT but as long as I stay away from gildan heavies, they usually stretch well enough to work ok
Could also design a maternity set where you could unzip/release more cloth in the stomach/waist area as you grow.
Then we could relabel them from maternity to something else and cross-market them to beer-bellied fat guys, of which there are millions. We'll be rich.