Thanks for the link, photos always are better for demonstrating exactly what tartan you are referring to.

Those two are, as has already been pointed out, dance tartans. There are actually numerous different "dress" versions of the MacLean tartan which have been woven over the years, most of which were created and woven by the D. C. Dalgliesh firm in Selkirk, which specializes in dancers' tartans. These two shown are both Dalgliesh designs.

In all but a very few cases these dance tartans have no official standing with the clan. The one exception which comes readily to mind is the Dress MacGregor tartan, which has been officially approved by the chief, specifically for Highland dancers in the MacGregor clan to wear.

Without any knowledge to the contrary I can only assume that the dance versions of the MacLean tartan have no official clan recognition, though I'll let our fellow forum members who are active in the clan society correct me if I am wrong.