If you're gonna screw up some sewing, let it be a pair of pyjamas that *likely* won't be seen by the neighbours.
First, begin a new sewing project at 11:00 pm when you really should be drooling on your pillow already. Underestimate how much lovely China Doll flannel (Michael Miller) to buy so that you have to lengthen the pants with scraps of sherpa fleece.
But make sure it's not the same shade of sherpa fleece that you use to construct the back of the shirt to add some stretch to it.
Next, use painfully thin bias tape when binding the neck seam so that you miss capturing some of the raw edge. Be too lazy to rip it off and start again. Just zigzag stitch over the parts you missed with unmatching thread. (I'm really on a roll here).
Finally, use some antique lace to close the neck. Really scratchy antique lace. The kind your kid is going to insist you remove with your good old friend The Seam Ripper.
Yep, she's still going to wear these pyjamas, and people might ask ooh, did you make those yourself? to which I'll have to fess up.