This year I fished it out of the cupboard to decide what I wanted to do with it. I thought that it may have been the lacy pattern at the back - should I just do stocking stitch for the back? The only trouble is that I didn't have much spare yarn left and didn't want to run out.
Should I substitute the lacy stitch for another that wasn't as open? In the end I decided to do the pattern the same just in smaller size needles.
Eh voila! It worked. The top isn't as baggy and sits much more nicely. Worth undoing and trying again.
The pattern is by Sirdar and the yarn is Summer Stripes.