All right smarty pants, those are not knitted in the sticks'n'string sense. Double-knit polyester is nasty material.
If you want knitted trousers how about these? I'm sure I could do you a bespoke pair if I could really be arsed.....
But I can't, so here's the pattern Ghastly trousers - pattern
and you can get the wool and needles from here Drops Fabel, A soft 4 ply sock yarn
Looking forward to seeing your finished trews. Good luck.