A karate-gi (or gi for short) is the white uniform worn during practice. If you’re just starting out, there’s no need to rush into purchasing the kit until you’re sure you wish to continue so give it a few weeks first. Until then, tracksuit bottoms and a tee is fine.
When you are ready to buy one, read up on the various options available. Your instructor will usually have some in stock and be able to advise you on which might be the most suitable.
A club jacket isn’t essential but they look good and are great for throwing on before or after training (or during, if you join in the run on Sunday mornings!). Made to order. Read more about them here…