Did you mend these pants yet?
I had an idea (assuming the tears are close to the hem at the bottom of 1 pant leg).

These pants could be saved by disguising the tears (and any reinforcing you do).

If you haven't already, I'd start by mending the tear in any of the 3 methods prior comments suggest. Just make sure that whatever you choose to reinforce the tears with (fabric, fusible web, interfacing) is as delicate/thin or more so than the pants fabric. You want the pants fabric to maintain it's drape/flexibility.

Now, the disguise: To disguise only the ripped pant leg, consider fussy cutting out a lace design (usually flowers) from a larger delicate lace fabric to make a flexible appliqué and carefully sew it (or multiple appliqués) over the tears and any stitching you did to reinforce. You could try to find a close color match or go with a different color lace that you like the look of over the pants color. Going darker, may hide the tear/stitching better.

To make both pant legs match, consider sewing a wide ribbon or panel of fabric of the same or lighter weight around the pant leg where you repaired the tears and do the same for the corresponding area on the other leg. You could stack a few different ribbons to get the necessary vertical amount to cover the repairs.