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
