Maternity clothes are not great. there are thousands of regular clothe styles out there, but just a few of maternity clothes, they don't fit well, at least not me. I decided to male a pair of pants for work from one of my favorite pair of pants, they have a slim leg, and are close fitting in the rear without being like a legging. It was super easy. I didn't add pockets, since tops are usually long.
All you need is tracing paper, i use kitchen wax paper, pins, fabric of choice, your favorite pants, lycra fabric for tummy band.
Take your favorite pants and spread one leg out on a flat surface. Pin your tracing paper on the front of the lag, close to the seam. Make sure to include the crotch area. You don't need to include the whole length up to the waist, since this will not be needed, only trace from where the elastic band will start down. This is shorter on the front that the back.
Trace with a marker around the seams.
Do the same for the back of the leg. The crotch on the back is wider, or deeper, so you may need to add paper here to have an accurate pattern. Mark on both paper parts a common area, the hip, or inner leg, so when you are constructing, you can match this.
Since the back of the leg is wider than the front,, it will not lay flat, so you have to wrap the paper around the leg.
Sew the center back seam.
Sew the band to the top of the pants. Turn the top raw edge under and hem with a zig zag stitch, hem your pants, and they are done!!! Easy!!!!!!!!!!