blanket stitch

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A buttonhole stitch used for edging around heavy material.

from the GNU version of the Collaborative International Dictionary of English.

• A buttonhole stitch worked wide apart on the edge of material, as blankets, too thick to hem.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun sewing A strong stitch, similar to a buttonhole stitch, used to finish and reinforce the edges of blankets etc.
• noun A similar, more decorative stitch.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a strong reinforcing stitch for edges of blanket and other thick material; similar to buttonhole stitch