After the sin - Adam makes a belt 

In Egypt we were commanded to eat the Pesach sacrafice wearing a belt 

The Kohen must wear a belt 32 amot long 

We make a special blessing each morning Ozer Yisrael Bigvurah relating to our belt 

Shulchan Aruch: One needs to gird oneself with a girdle at the time of prayer; even if one wears a sash, such that one's heart does not 'see' one's nakedness, because of concentration. But for the rest of the blessings it is permitted to bless them without a belt, so long as one is wearing trousers