For myself, I'm going to place myself most closely in jn3's category #3 (I think you have a solid, if not comprehensive, list there). I got my BA in 2002, and worked odd jobs - college admissions, office, and bartending - before finding a "real job" I liked. Though I don't have to wear suits daily, I do wear a tie/jacket. It makes me feel like I'm going to work. Also, the time I spent in the office and in the various settings of college admissions made me realize even more how much people judge others based on appearance. I don't mean to defend book-by-its-cover judgment, and most of that judging is "Wow, he tucks in his shirt," not, "Wow, the Prince-of-Wales pattern on his MTM shirt is matched perfectly at the shoulder and sleeve." But still, clothes that fit and complement you are good for confidence, and confidence is good professionally. I'm glad I have a hobby that has benefits in addition to personal amusement.