I've been looking for something to place my pump in under my shirt but most of the belts I found have plastic clips or velcro fastening which I found uncomfortable. I was considering trying to find a lycra supplier to make something more comfortable and then stumbled across a company called Diabete-Ezy who sell a lycra band that has no fasteners and also fits snug to the body. I've had it a week and it works reasonably well. I think if I had a "normal" stomach and not one deformed by my pancreas operations it would be perfect.
Even if you do not want the product I would recommend a visit to the web site. The company is owned by Steve Renouff who back in the 1980's & 90's was my number 1 sporting hero. It turns out that at that time when he was one of the worlds top rugby league players he was also a T1 diabetic. One of the reasons for his family setting up the company is that 4 of his children are also T1 and pumping. You can only admire what he and his wife are doing. Visit the following web site for the full story....
http://diabete-ezy.com/About-Us-pg15155.html
PS the Cumfy Fit Insulin Pump Belt can be bought from Diabetes UK.