I've made the Ottobre jumpsuit from issue 4/2011 a few times and while I love it it is not the quickest thing to make for a 2 year old. While flicking through my stack of Ottobre magazines yesterday I noticed one in issue 4/2014.
It was traced and sewn before lunch. This is a very quick sew, a few rolled hems (I'm very thankful my Bernina Overlocker does this with the flick of a lever), some shirring, a few seams, four ties and that is it.
I used a bit of voile from the stash (I think I used less than 60cm). Perfect for the hot weather.