So I love leggings on babies, they're just so cute! I decided to make some for Lilly and after a few not so great attempts I believe I've mastered it enough to share, below are the steps in case you're interested
The link I used is here:
Great Link for Leggings!
I used 1/2 in elastic but if I did it again I would use 3/4 inch. Also, I didn't have the double-stitch needle but I think they still turned out fine.
I purchased knit fabric for the white and purple pair so those cost about $2.50 to make (each)
I went to the thrift store and got a t-shirt for $.99 which I used for the turquoise pair. The fabric stores don't offer a lot of options when it comes to knits so sometimes you'll find better patterns by looking through old t-shirts, plus its a cheaper option. I was able to do that pair of leggings for about $1.15.
Now you go try some :)