I have the original rx100 so I don't know what the m3 is like but it fits in the pockets of my jeans no problem but it is on the upper limit of being okay. I got my parents the g9x and it is noticeably smaller. I highly recommend the g9x it will take decent pictures indoors with no flash and only artificial light or just with day light coming through the Windows.
Great camera especially in low light conditions. Love mine.
Old man M&S with elasticated waist!
(shock) It certainly is a great camera, I never suggested otherwise. It doesn't fit in a normal jean pocket though. Not sure what you're wearing XD
The GX7 goes in my pocket and it's an ace camera. Just how tight are your jeans dude?