Thing 1 still wets the bed at night, so I bought the New Conceptions Sleep Dry Briefs pattern awhile back to try. I had this half-sewn for months and finally finished it. The pieces looked enormous until I sewed it all together and got the elastic in, but it really does fit okay. We've had one trial, which was unsuccessful - I'm not sure if I need more padding or to tweak the fit. But I will perservere! And I'm thinking of also getting the training pants pattern for Thing 2.
I put the buttonholes into the muslin shirt for DH and topstitched the facings down. Now I need to sew in the buttons and try it on him again to make the adjustments to take in the sides and take up the hem. Then I can adjust my pattern and cut out one of the "real" shirts.