Customer don't really care how you dress
I work for HP Cloud unit and I have had my share of having to work with legacy ES...
several months back i recall a joint ES & Cloud F2F meeting with a fortune 50 client, Cloud guys were wearing faded jeans and T-shirts and ES guys were all in suites. The clients executive team go so tired of ES trying force feed them crappy software and services, they kicked ES team out and only wanted to talk to us.
Customers value our ability to solve hard problems and provide great service...nothing else matter