Reference garment: None. I just cut out the bottom of the sweatpants that I previously made.
Pants block: Knowles men trousers block. I simplified the instruction by removing the darts.
If you are following along, the following diagram may be helpful:

Fabric: Knit
Everything important is recorded. You just need to change fabric and add topstitch. I also show a 'quick and dirty' way to imitate the waistband casing. If you want a more realistic waistband, you can always refer to other youtubers.
Download link (valid for one month only).