Why Presentation Matters
The main thing here is this: you need guests to feel like they're in good hands.
They need to trust you, respect you some - this is what's going to allow you to more easily guide their decisions, command the table (i.e. control the flow instead of them just bossing you around), and ultimately just have a more pleasant experience serving them.
If you look like a slob child that doesn't know shit... they can't really take your lead.
You look reasonably put together, kinda like you take care of yourself and have good taste... night and day difference. Trust me I'm right.