The Angel Wings Pinafore pattern is a lot easier than it looks. I would rate it an intermediate skill level. The lacy texture and ruffled sleeves make it look more complicated than it really is. I followed the pattern pretty much exactly, using sport weight yarn and a size H hook. It is crocheted in one piece, and I was able to complete it in one day.
Once this was done I really wanted to make a diaper cover to match and I came across this Newborn Diaper Cover pattern. I didn't follow the pattern exactly, but used it as a general guideline for my own cover. I "frilled" it up by going around the edges with picot stitches to create a ruffled edge. I think in retrospect the cover could have been wider in the straps and the backside, but overall I'm pretty happy with it.
UPDATE: My daughter has arrived! Here she is wearing her pinafore!