The first pair I made were in an olive coloured drill that I had managed to snag on clearance at Spotlight one day. These are size 3.
The second pair I've just finished are in a size 0 for my 12 month old (and there is plenty of room). I made these using some corduroy I picked up at an op shop. I probably wouldn't make these pants out of cord again (unless maybe it was a microcord or something) because when it came to sew the waistband I was sewing through 4 layers of corduroy at the pockets and my sewing machine didn't particularly like it, even when using my denim needle.