Best brands with clean/ classical aesthetic

Hello, I’m turning 25 next week and I wanted to change my style to a more mature look. What brands in your opinion have a clean, classy, “old-money” aesthetic. I want to look mature and put together, but also not old lol. What brands are the best at pulling this off on a budget? I was thinking Ralph Lauren, what else do you all recommend?

Edit: Thank you so much to everyone that responded and gave amazing advice. I love this community!