Having little kids meaning always growing out of clothes. My oldest is going through a growth spurt and suddenly has no warm weather clothes to wear. Fortunately, I found shorts for $4 each. Their elastic waist and sizing, though, means that my little man is in between sizes. I bought the size that's a little too big and figured he could grow into them. Well, after getting home and test-driving them, it was clear that his shorts were falling off of him. What to do?
My solution was to sew a short length of elastic at either hip, bringing in the waist a little on both sides. Voila! The shorts stay up, and when he really grows into them, I can just snip the elastic (perhaps use the seam ripper to remove it...but let's be realistic).
Our camera is MIA so I sketched a really quick (really questionable) diagram of the inside of the waistband to show what I mean. I'm sending us back to the stone age in internet terms...