Originally Posted by Eric F

If you're doing relaxed riding, relaxed clothing makes sense. If you're riding at speeds where aerodynamics don't matter, relaxed clothing makes sense. If you don't mind clothing flapping about when you're riding at higher speeds, relaxed clothing makes sense. If what you're wearing is what you prefer, keep on keeping on.

However, be aware that not everyone has the same preferences, or wants the same results.

Over the last couple of years, my weight has fluctuated within a range of about 12 lbs. All of my cycling clothing has continued to fit me. Maybe you gained more than a "few extra pounds"?