From: http://artisanssquare.com/sg/index.php?topic=874.0

LINEN WEIGHTS:

Sheer Weight (2.5 oz/yd2)
Thread count warp : 38
Thread count weft : 34
Curtains, apparel

Light Weight/Handkerchief (3.5 oz/yd2)
Thread count warp : 51
Thread count weft : 43

Middle Weight (5.3 oz/yd2)
Thread count warp : 46
Thread count weft : 37
apparel, bedding, pillowcases, interior design, home furnishings

Heavy Weight (7.1 oz/yd2)
Thread count warp : 38
Thread count weft : 32
apparel, placemats, napkins, table runners, bath towels, kitchen accessories

Canvas Weight (9.1 oz/yd2)
Thread count warp : 21 – 52
Thread count weft : 34 – 62
apparel, placemats, napkins, table runners, bath towels, kitchen accessories

Higher priced/premium linens usually have a higher thread count per inch.

Linen Sources:

Ulster Linen – https://ulsterlinen.com/

Fabrics Store – https://fabrics-store.com/

Couture Lin – http://www.couturelin.us/