For me, the adoption curve of the Internet of Things is fascinating to observe. Take the PoloTech shirt from Ralph Lauren, for example. It's a "smart shirt": the skintight shirt measures your heart rate, how deeply you're breathing, how stable you are, and a host of other key biometrics. All this is sent to your smartphone. One will set you back a cool 300 bucks. But it's probably not the price that will separate the adopters from the laggards in this case. In the case of the PoloTech shirt, as with many of the new pieces of wearable tech, it's …