When you become more adventurous and friends start admiring (and wanting) your tea cosy, you can vary the pattern by knitting stripes, and squares (and even intarsia designs) following the basic pattern. You can even knit an American flag, although working with more than two colours really gets you in a tangle.
The pleats on the wrong side retain the heat from the tea and keep the whole pot warm for much longer. My mission - no more cold tea pots!https://www.instructables.com/id/How_to_make_a_proper_cup_of_tea/
Now all you need to know is how to make a 'proper' cup of tea!