What to wear for college interview?

Just wear the kind of clothes you'd normally wear. Everyone else does. You don't have to "dress up" for a college interview. That's not what prospective tutors are looking for. They're looking for what kind of person you are - not how fashionable or smartly dressed you are; it's not a job interview, where they do look at how smart you are dressed. It's only likely that you'll need to dress smart when you actually start your course - some (not all) colleges ask you to wear a uniform for Travel & Tourism (I think the one I might be wearing is purple!); but then some colleges don't, so you'll be able to wear whatever when you're on your course too. Just wear whatever you feel comfortable in.

something you would wear to church so something simi dressy

It's always better to go slightly over dressed than under dressed. I would probably wear something that's smart casual and avoid jeans. It will show you are serious about this course and ultimately having a career in the industry.

Wearing a bikini will get you anywhere.

SMART of course!