Where do I go to change class?

Where do I go to change class?

And for examle If I choose to be Pegasus how do I get the pegasus cloth?

If possible give me some screens.

Thanks

Go to the old man change class, click on him again and he will give you new cloth (you need lvl 59+)
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If I change class do I have to lvl my first cloth from the begining?

Nope you will lose nothing.

Thank you.
You could do a guide about this.