easy solution
Besides the other suggestions (just check rolling resistance and appearance of tire on ground), what I did to make easy to check and inflate is just drill about a 1" hole in the side of each pant, at the appropriate location to hit the valve stem. Then I put in a pop-in plastic hole-filler (sorry, I don't know the official name, but available in any hardware store to cap a hole in a sink top or electrical box, for example).
Then I made or bought 3 tools to support it - a pressure gauge with straight-in head, a 10mm socket on a rod (to RR&R the cap), and a straight-in air chuck.
Works great, hardly noticeable when the plug is in place. Of course, it helps that my pants are white and these come in white plastic (and maybe black or metal to be painted).
The I used a silver sharpie to mark the tire sidewall at 6:00 when the valve is aligned with the hole. It all makes checking and setting tire pressures easy. IMHO, look and feel of tires isn't reliable enough and pressures can sneak down too low before you notice it.
I'll upload a pic of it
HTH,
brian