For my current job, all of my interviews were over the phone with the main one which I had to present a case study, was over Skype.
It was actually, supposed to be in person but because my wife was pregnant and due any minute, I couldn't travel so we did it over Skype (we ran to the hospital for delivery the second I hung up).
But yes, I wore a full suit during the interview (as did the interviewers but they were in the office).
I have actually held meetings over Skype where I've worn a nice shirt on top and boxers on the bottom lol.