Dress Codes

I gotta admit, I'm not a big fan of dress codes.  I understand that there has to be some control over what we wear to work, but come on.  When it's 104 degrees in July and you have to wear pants to work, what is that all about?  Or what is the big difference between jeans and slacks?  They are both pants right?  I think people would function better if they got to wear t-shirts and shorts.  Why not?  I get it if you work in a store and people need to identify you, but when you sit in an office all day and never see customers.  Come on.