As is often the case with me and Crochet, I couldn't get the gauge required, so I did have fewer stitches in the row than directed, but I did the decreases exactly as in the pattern and it worked fine.
I did use a 3mm hook for the bottom, followed by 2.5mm and then finally the 2.25mm hook for the rest. This has made a slightly flared lower edge which looks better than straight sides for me. I used a 2.5mm hook for the edging (except the bottom edge in 3mm), as I found the 2.25mm a little tight. The yarn is Noro kureyon sock.