When I finish a knit it is often in need of blocking to adjust the sizing. The different directions of the stitches tend to push or pull areas so that they don't meet the way they should. This is easily fixed with a spritz of water and some pining to my padded table. I don't soak the knit in the tub, but just use my spray bottle and get the problem areas good and damp, and then make my adjustments. Wool is alive and will respond to authority! It will sit overnight and then tomorrow I will add the buttons.
The length (30") and width (25") is measured and I keep a photo record for this design, should I desire to repeat it. Of course I do.