I should make a dressier cardigan for more grown-up occasions like interviews and work.

The construction is extremely simple. There’s hardly any shaping, just a bunch of rectangular shapes sewn together, and then crocheting along the front and neck to make the collar. So I imagine it would be pretty easy to modify by adding or subtracting stitches as needed.

Another way to increase the size of the cardigan would be to use a heavier yarn (sport, DK, or worsted with good drape) and larger hooks (5-6.5mm).