As your cycling ambition grows, so might your bespoke clobber. Jeans may be fine for a quick jaunt, but if you grow into all-day riding you may find they chafe where you don’t want chafing. Cycling clothing - close fitting leggings and tops - generally are tailored so as to keep seams free from areas of friction, and are close fitting to help reduce fatigue from drag / flapping noise etc. When the bug bites and you get pedalling further afield, buy the best clothes you can afford. Build up a capsule wardrobe of a few good quality items whose style you’re sure of. For a road bike or touring a set of winter long tights, a few baselayers in thermal fibres, a fitting top with venting zips, and a raincoat. Oh, and a wool hat that comes down over your ears. And warm gloves and wool socks. Light top and bib shorts for summer. If you become a racing snake there are lots of rules. I can’t help you there. Go look at Velominati for hints. I believe black is de rigeur and team colours are frowned upon (unless you cycle for that team, of course). Do what suits you. I steer clear of bargain basement gear - experience leads me to conclude that you get what you pay for. Someone will be along in a minute to rubbish everything I’ve said, so I’m off while I can get away.