I’ve had a hard time finding training pants for Dexter, and because I like to make things, I decided to give training pants a try :). I browsed a little for tutorials before deciding to just do my own thing.
I will preface this by saying they didn’t fit very well, so I’m going to make some changes. However, I think this tutorial will be a good one when I work out the kinks. I deliberately chose a knit fabric that had very little stretch… I was worried they’d become floppy. It turned out to be a mistake because I had to work really hard to get the pants over his chubby legs and booty. Next I’m going to try a knit with more stretch, and make the cuts a little roomier. Since the center panel is non-stretch I now know they do have to be cut bigger.
Onward!
Supplies
Undies to use as a template (until I upload a pattern) {UPDATE: Amber at Mom Road has created a printable pattern using this tutorial! There are a few modifications with her pattern, including a PUL layer!}
Prefold diapers
Knit fabric (I used an old t-shirt)
Cutting
Step 1: Choose undies to use as a template. (After I perfect my pattern I will upload something printable in case you have no undies to work from) I used 2T-3T undies.
Step 2: Lay undies on folded diaper, centering undies on the thickest part. Cut diaper so that when folded it’s as tall as the undies. I chose the width by cutting about a half an inch past the thick part of the diaper. (BTW how CUTE are those undies???)

Step 3: Put the folded and cut diaper inside the undies to determine leg-hole cuts. Mark about a half an inch from the leg-hole for seam allowance. Do this for the front and the back.

Step 4: Make leg-hole cuts. One of mine looks a little sloppy, just focus on how pretty the one on the right is 🙂
Step 5: Make the stretchy side panels. Fold knit fabric vertically. Lay undies on top with the side against the fold. Lay diaper on top of undies, letting the edge overlap the the edge of the knit fabric. This takes care of your seam allowance. (Does that make sense? If this step is horribly confusing and/or the picture doesn’t make sense, leave a comment and I’ll try to do better!!) Cut 2 of those.
Step 6: Make the waistband. Fold vertically, line one size of your undies up with the fold. Cut the waist band about 3-4 inches wide to allow for folding over and the seam allowance. (I think I prefer a wider waist band, and next time I will cut closer to 4 inches.)
Step 7: Create the leg bands. I forgot to take a picture for this step. but basically I flattened the leg-hole of the undies to get the length of my strip. I cut to a width of about 2 inches.
Here are all my cut pieces to give you a reference for how big each one is and where they they should go:
Sewing
Step 1: Sew side panels to the back of the diaper, right sides together so that the seam will be on the inside (unless you want the seam on the outside. I considered that, it might be more comfy for your toddler). Line the top of the diaper up with the top of the panel, leaving the extra fabric at the leg-holes. We’ll trim that later. I also used a straight stitch for this step.
Step 2: Sew side panels to the front of the diaper (also right sides together, seam on the inside).
Step 3: Trim excess fabric to shape the leg-holes.
Step 4: Sew ends of the waistband together to create a loop, seam on the inside.
Step 5: Fold the waistband in half, wrong sides together.
Step 6: Turn your pants right side out. Pin your waistband to the outside of the pants with all raw edges together. I also made sure I pinned the seam of the band to the back of the pants, because it would have made me crazy if I didn’t 🙂 
Step 7: Sew on waistband. IMPORTANT: USE A ZIGZAG STITCH!! If you use a straight stitch for this step the threads will pop when stretched… boo, we no likey.
Step 8: This is actually a lot of steps combined. Follow steps 4-7 for each leg-hole. Don’t forget to use your zigzag stitch!!!!
And now you have a pair of training pants!
They look a little funny here with all the threads and stretched-outedness. In theory, you’d clip the threads and be done. But in reality, I tried them on Dexter and they just didn’t fit. Sure, I managed to get them on him, but, as I said before, there was just not enough stretch. But they sure are cute!!!

