Just thought I'd share this little trick I came up with. A friend of mine got some pants for her little man and they were a little big in the waist for this little peanut 2 year old. So I offered to see if I could fix them up for her.
Here are the supplies you need to make your pants adjustable waist.
Elastic, buttons, thread, exacto type knife and cutting mat. I also ended up using some prepackaged bias tape--I used double fold extra wide. I first cut 3 holes lengthwise in the elastic (about 4" long). Then I sewed the piece to the inside of the pants. Then I carefully sewed a casing around it with the bias tape. Hand sew a button and voila! Adjustable waist. Here's the result:
This is the inside of the waist folded over so it could be seen. It bunches a little because they are already elastic waist pants, but will work great for holding up his pants! :)