Ok, who said that we should dress like royalty?
Where are you getting that idea from?
One would think if it was important it might show up in at least one or two seforim.
If you want to loook like a lowlife that is fine, no one is stopping you.
Wearing denim skirts does not make one look like a lowlife, and if you look at people who do like lowlifes, you need a major attitude adjustment.