In over 10 years of travelling I've never used a money belt or pouch. I find them horribly uncomfortable - especially in the heat - and to be honest a bit of overkill.

The best advice obviously is to be aware of your surroundings and deny pickpockets the opportunity to strike. Don't keep your wallet in a breast or back pocket, especially when in crowded areas. Transfer it to a side pocket instead where you have a higher chance of feeling any movement, keep your hand on it when you can to if you are in crowded trains/buses etc. Develop your situational awareness, this doesn't mean be paranoid of everyone, but it does mean just be aware of people around you, distraction techniques such as people brushing against you, touching you without invitation (difficult in some country's), having a photo taken with you and putting their arm around you ... etc. There are many others. Be aware, but don't be paranoid.