The fulle plaid:
Essentialy there are two types of kilt; the Feileadh Mor (also known as Geat Kilt or Breacan Feile) and the Feileadh Beg which is the more common type of kilt. The Feileadh Mor (pronouncied 'phili more'),is really just one length of double width tartan, usually 6-7 yds in length which is gathered into pleats and belted round the waist. The Feileadh Beg is a hand or machine sewn garment which is worn just above the hip and fastened by buckles.
After reading the article posted by the Tartan Museum I think your right innthat I'm wrong about some of the pipers in the pictures in that they are most likley wearing the "Half" belted plaid which is worn with the Feileadh Beg. I think that the folks in your picture are also wearing the Feileadh Beg with a form of shoulder plaid.

http://giftshop.scottishtartans.org/plaid.htm

http://www.gaelicclothing.com/plaids.htm

So apologies and I do stand corrected.