From Wiksten:
Note: As of December 31, 2022, this pattern is no longer available.
The comfort and ease of these elastic waist pants make them perfect for active babies and toddlers. They're cut slightly long so that they can be cuffed and un-cuffed as the child grows. Beautiful French seams lend the pants an heirloom quality, and their simple construction makes them a breeze to sew.
Linked blog post describes how to add a lining to the harem pants to make them reversible.
Sizes: 7 sizes from 0 months to 3 years