Sheep and Fish are rare exceptions to the plural rule and indeed in the case of Fish using the plural Fishes is also acceptable. There are other plurals which are different to the singular like Goose and Geese.
No matter what anyone says Kilt used as a plural sounds just plain wrong. 
oop:
[B][COLOR="Red"][SIZE="1"]Reverend Earl Trefor the Sublunary of Kesslington under Ox, Venerable Lord Trefor the Unhyphenated of Much Bottom, Sir Trefor the Corpulent of Leighton in the Bucket, Viscount Mcclef the Portable of Kirkby Overblow.
Cymru, Yr Alban, Iwerddon, Cernyw, Ynys Manau a Lydaw am byth! Yng Nghiltiau Ynghyd!
(Wales, Scotland, Ireland, Cornwall, Isle of Man and Brittany forever - united in the Kilts!)[/SIZE][/COLOR][/B]
Originally Posted by McClef
Bookmarks