Do I have to wear swimming attire to go into the pool? Like can I wear a tshirt and shorts and still go swimming?

No. Swim suits are required. You can wear swim shorts with a liner inside.

It will be nice if they make wearing a swimming cap at all times last time i went there it was just horrible with hair and fake hair everywhere stop going

Yes swimming attire is required.

I believe you have to wear your swimming attire