Some years ago when I was first researching belts, holsters and concealed carry in general, I came across this website - it may have been linked from a thread on GlockTalk, but I no longer remember. This site was extremely helpful in my research!
I recommend spending some time reading through all the articles as you will receive a quick, rounded education in the benefits of a good gun belt.
Personally, I purchased 2:
1) the wilderness instructor's belt that I wear every day - so easy to use, always the right tension.
2) the leather gun belt from Gunner's Alley for dress wear, I got the holes punched every 3/4 inch to help with my "adjustable sizing"!!
Bottom line is that there is no substitute for a good gun belt if you are planning to carry.