How come more coaches don't just wear a sweater courtside instead of $$$ suits?

In the Spirit of March Madness that begins this week

The guy could coach though...

https://www.yahoo.com/sports/news/bobby-knight-on-the-indiana-staff-that-fired-him-i-hope-theyre-all-dead-183319215.html

Oh, and I am thinking DUKE will win the whole deal this year