I think it's this

http://tinyurl.com/26o79h9

Tweed is a rough, unfinished woollen fabric, of a soft, open, flexible texture resembling cheviot or homespun, but more closely woven. It is made in either plain or twill weave and may have a check or herringbone pattern. Subdued, interesting colour effects (heather mixtures) are obtained by twisting together differently coloured woolen strands into a two- or three-ply yarn...
The original name was tweele, the Scots or Scottish for 'twill', the cloth being woven in a twilled rather than a plain pattern.

http://en.wikipedia.org/wiki/Tweed_(cloth)

Diccionario de la confección: - Google Books Result
Gerhard Rebmann, Karl Hertel - 2000 - Crafts & Hobbies - 1079 pages
timbro • tessuto (m) spinato diagonale • tessuto (m) (stretto) lavorato a maglia D ... (m) ■ down twill О croisé (m) pour duvet ▲ sarga (f) para plumones ...
books.google.co.uk/books?isbn=3794906543...

tartan describes the checked pattern on the cloth, but the fabric is twill
http://www.house-of-tartan.scotland.net/scottish/itempg.asp?...

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Note added at 17 hrs (2010-07-31 09:59:25 GMT)
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http://www.etimo.it/?cmd=id&id=16005&md=ee815522b78cb3012e2e...