i thouhgt that Levi Strauss first made these pants from cloth taken from sails on boats. and i also thaought that the name was because they werre dyed blue with Molybdenum. The Molybdenum (Mo) part may be off but here:

http://inventors.about.com/library/inventors/bllevi.htm

http://www.levistrauss.com/

some history here: http://www.levistrauss.com/about/history/denim.htm

http://www.levi.com/

he was included in a documentary about the West on PBS
http://www.pbs.org/weta/thewest/people/s_z/strauss.htm

what do you find on this page? for me it is just all blue'
it was supposed ot be the denim survival guide. http://olah.com/

and whne summer would come we would always cut the legs off of our
jeans and turn them into shorts---"cut-offs" with ravelled fringe..

http://www.wrangler.com/

http://www.leejeans.com/

http://www.leedungarees.com/

Bib Overalls are usually associated with farmers...
the kids these days often wear them with one strap
un-hooked.

My favorite type of pants though are the ones you can
convert to short by zippin off the legs..but they rarely
come in denim or cotton ususally synthetic fabrics
that dry quickly..good for travelling or hiking.

http://www.rei.com/category/4501798.htm
http://www.rei.com/category/4501397.htm
http://www.cil.com/cl-convpants.htm

or here is the extreme...a fantasy...
http://www.halfbakery.com/idea/Zip-off_20Pants

where do clam diggers fit in? (length - wise)