It seems obvious to many that your pants, jacket, or skirt fitting a little more tightly is a sign that you need to lose weight, but if you're busy with work, a young family, or other pursuits it can seem easier just to buy a pair of bigger pants and worry about it later.
Personal finance blogger Mr Money Mustache posits that this is life telling you that your current lifestyle is unhealthy and you need to make some changes. Every time your pants pinch, that's a reminder to take the stairs instead of the elevator or eat grilled fish rather than a bacon cheeseburger.
Those tight pants are your biggest ally in addressing the underlying problem -- if you give them up, you'll be allowed to forget what the real problem is: your lifestyle has become unhealthy and you're [too wrapped up in your pursuits that you're not taking time to take care of yourself].
Consider that whenever your clothes are tight and you haven't worked out in a while that perhaps you need to take a minute from your career or family to focus on exercise and proper nutrition.
You Can't Cure Obesity with Bigger Pants [Mr Money Mustache]