If you live somewhere wet, get a good quality waterproof coat. Like actually waterproof, not these fashion coats that really aren't. ยฃ100-200/but it'll last you at least 10 years. Assuming you're at the end of teenagerhood where you've finished growing.
Otherwise I'd save to get a hifi system of decent quality. Something like wharfedale diamond 9.1 speakers and a second hand NAD amp, 3.5mm to RCA cable. Would set you up for a long time of musical enjoyment.