This is a tea cosy for a standard medium round teapot. If you are making for a bigger or smaller teapot adjust the amount of stitches on your starting chain row accordingly.
The Gauge is not important as long as it is consistent.
To make this I used stash yarn in four different shades of green for the body of the tea cosy and small amounts of different colours for the flowers.My tea cosy used approximately 50g of yarn.