Here is an example of a basic suit. It's simple yet classy. Do not forget the tie clip! A floppy tie is enough to bring your whole look down. Also, a fitted shirt is key. You don't want to look like you are swimming in your clothes.
Style Guide: J.Crew women’s Regent blazer, Thomas Mason® for J.Crew collarless tuxedo shirt in stripe, men's Italian silk pocket square in medallion print, Point Sur shoreditch straight selvedge jean in Vernon wash and Biella crackled leather loafers.