I'm a big fan of wearing bib overalls, but sometimes you just want a workwear trouser.  These B01 trousers are the trouser version of Carhartts signature R01 bib overalls.  Cut the bib of the overalls and add a waist band and this is what you'd end up with.  The same heavy duty duck canvas, just without the bib.

Features

• Loose Fit, Straight Leg
• Generous fit through the seat and thigh with the most room to move which sits slightly above the waist
  
• Two front slant pockets with extra hidden coin pocket in right front
• Left-leg hammer loop
• Two fully lined back patch pockets
• Double front for added strength
• Right leg back utility pocket for easy storage of ruler or welding rods, left leg back tool pocket
• Folded single stitched clean finished hem
• Triple stitched main seams
• Carhartt label sewn on pocket
• 12 oz/yd² - 407 gsm
• Firm Duck
• 100% Cotton

I've found the sizing to come up on the small size, especially compared to you usual size in the the bib overalls.  I would suggest sizing up one from your regular size.