I have 11, plus a sad little mistake from eBay.

5 Utilikilts: 3 originals, a Workman's and a Mocker.
3 Pittsburgh Kilts: corduroy, lined denim and suede.
1 USAKilt: custom design in black denim.
1 Amerikilt: Tigerstripe Camo.
1 traditional MacGregor tartan.

The first ten I wear regularly, 'coz I can wash them myself. The wool traditional I save for formal occasions.

(I think my "sad little mistake" might be the same kind that the Kilted Chief referred to as "raggy e-bay music dealer things." I'm guessing he's talking about Thump Music, who do not deliver the product they promise.