Research suggests that within 90 seconds of meeting someone we form an opinion about them mainly based on appearance. Even if what that person is saying seems to contradict their appearance, we don't hear it because what we see is much stronger.

How customers experience your 'brand' can have a powerful influence on whether they return to your outlet.

Review your staff uniform or dress code to ensure it is sending out the right message. It might also be worth formalising your policy on piercings, make-up, jewellery and so on - which of course has health and safety implications as well as being an important factor in how your staff present themselves.

See your staff through the eyes of your customers.
Make it clear to your team how you expect them to present themselves.
Use incentives to motivate your staff to adopt appropriate behaviour and appearance.
Review regularly.
Practice what you preach!