new referee

[lmathews19]

Hey guys, I am a new referee just starting out. I have never called a basketball game in my life, just baseball, and was getting ready to purchase a few things on-line at purchaseofficials.com and wanted to know if I should get the pants to fit tight or a little loose? I only ask this b/c I know it's probably kind of old-school or unprofessional to wear a belt these days and I didn't know if most of the pants came like a tux wear you can tighten them yourself. Thanks alot, any other recommendations?