I'm a big fan of Oliver + S patterns. Really, who isn't? The raglan t-shirt pattern may be my favorite yet, and it is by far the quickest to whip up. I recently made a couple raglan t-shirts, size 3T and 4T, that I'm really happy with. I found the Paul Frank fabric on sale at Joann's, and the blue (I think) came from the Textile Center annual garage sale.
I tried out two different hems - on the left I did a blind hem with my serger. On the right I used a twin needle in my sewing machine.
Cutting out the t-shirts took less than an hour, and serging the pieces together took about 10 minutes. The serged blind hem took approximately 17 tries and two hours. Ugh. I should have given it a few more tries, because it drives me crazy that it doesn't lay perfectly flat and the stitches are not even. The twin needle looks great but it's not nearly as stretchy as the serged blind hem. I prefer stretchier hems for kid's clothes, so I'll be practicing the serged blind hem for next time.