This article is of interest but view with caution - the main contributions are from kiltmakers and in particular from Howie Nicholsby who wears his kilt daily to promote the fashion kilts he designs. He has done a lot for modernising the kilt image in Scotland - it now common to see young guys wearing Howie type modern kilts at hip events - latest example being the opening of the Film Festival in Edinburgh where all the male staff wore modern kilts and were greatly admired by festival attendees.
As for an increase in kilt wearing generally; whereas it is still a garment mainly worn for weddings, formal dinners, burns suppers, rugby internationals, tartan army (scotland football fan) matches, graduations, parties and such like (ie dressing up) I do find that Scots - particularly younger ones are wearing it 'out and about' - I do find it being worn 'down at the pub' but for daily wear less so. That's not a cause for concern given the massive increase in kilt wearing over the last 10 years - if devolution can bring that about - imagine what independence would do ? Daily kilt wearing ?

Picture of Howie Nicholsby in High Street, Edinburgh sporting one of is daily wear kilts :