Is it a sin to wear a thong to church?

I want to wear a thong to school tomorrow, but our whole school is going to church. Is it a sin to wear a thong to church?
Update: K. I am not catholic, my family is. I am a satanist. But sadly I go to a catholic school. I'm not easy. I have a fiancee. I only wanna wear it to have fun with him after school.
Update 2: Here's a link to my pics! :) http://www.flickr.com/photos/shycutie15xxx/7111146565/in/photostream
Update 3: I really don't care if it's a sin or not. For one I like wearing thongs. Second, if it's a sin that makes it funner for me to do!! ;)
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