Time to switch to the sewing machine, pat your serger and let her have a rest.

Topstitch leg binding seams. If you're feeling fancy use a double needle. I really like better the finish but I had 15 minutes left before supper so I just used a 3-step zigzag. Notice how I'm aiming the center opening of my presser foot towards the seam. Repeat with the other leg



Time to turn inwards the waistband. I added a "tag" (read scrap of grossgrain ribbon) in the back, as dd potty-trained recently and has problems putting her unides in the right way. Topstitch using a 3-step zigzag, stretch stitch, honeycomb stitch, or double needle. Pull slightly as you go



TA DA! Those are Maria Alejandra (2y) version, with high rise (tummy warmer)



Those are Maria Sara's (6y) lower rise as she doesn't want her undies peeking out of her jeans. I used a double needle here