Questions about easton st 16 pro stock pants

[nicker87 47]

The first question I have is are the st 16 pants a 2 peice pant? If so can I attatch either part to another brands upper or lower? I ask because unlike most other 2 peices pants if the st 16 are, they have that kind of wave in the belt area so it looks like the buttons would do the same? My other question is on the fit, just wondering how they fit to a ccm 520 pant? Iv seen in the past that the Easton looks a little looser in the legs the some other pants, is that true? And how is the tail bone and hip protection in the Easton's? If any one can help it would be much appreciated.