Kids pj pants from this book - The Liberty Book of Simple Sewing by Lucinda Ganderton. Instead of needing front & back leg pieces, you cut each leg as a whole & essentially make 2 leg tubes that you sew together & then add a waistband. Easy peasy.
The pattern called for basting most seams first - I went straight ahead sewing without basting and it worked out fine. I adjusted the length of the cuffs in the given pattern & could have gone even shorter, but guess that means there may be room for growing into.
Someone likes them a lot - she wore them all night...and day!