Introverts must save a lot of money. No hosting parties or getting food to take to parties. Save on gas and other transit costs. And, as the last week of being sick has shown me, I am apparently perfectly willing to wear the same grey sweats, t-shirt, and blue sweatshirt for five solid days in a row. (Okay, I took them off and washed them once in the middle. So maybe you'd want two sets.) All the pretty clothes in my closet look at me reproachfully when I go in there, but I don't care. Comfy and warm wins.