I've once went three weeks wearing the same pair of underwear and socks
Why would you go three weeks without changing?
I'm lazier than you could ever know.
It's very unhealthy and unhygienic to wear same pair of socks and underwear everyday. If you don't want to catch any disease, you should keep yourself clean.
It's not so bad. I don't smell and I'm good on money. I save a lot of money that way.
I hate to tell you but I'm sure others can smell you. Try to keep yourself clean more often.