Not in software and website development. It is very out of place.

Depends on the position and the company. Ask the HR person or whoever’s scheduling you. If you’ll be meeting with customers like government or finance, they may want to see you in a suit even if you won’t be wearing one every day.

Not in software development in the US. I wore ripped skinny jeans, converse, and a t-shirt to the most recent in person interview I had. I was hired.