Hi anon!! There's obviously a little more going on with that, which HJ will explain at a later time in UTCH! But at the time it was a good enough explanation for SH until later on down the road when he thinks about it more. Dancer belts are used to keep everything in place during high movement activity and to also create a flat look under tight clothing. But like I said there is ONE more thing that HJ does so he would feel a little more in control. And him and SH will talk about it in later chapters!!