I first started wearing Dickies Bib Overalls in 2005 when my wife bought me my first pair. I have been wearing them ever since. I literally wear them "Every Day" and have not worn any other brand or style of pants since. (I am just being honest here, when I say Every Day, I actually do wear them "Every" day.) They are well made; durable and comfortable. Believe it or not, I still have my first pair! I out grew them before they wore out. Though they are a little thin in areas, I would still wear them if they would fit.
My first pair did have flaws, but they have improved the design since then. One example is the shoulder strap button clip. The old design had a crimp sleeve keeping it in place. The crimp would eventually come loose and the clip would come off. They have since improved the design by forming a bend in the two ends joining them together, keeping the clip in place on the shoulder strap. They have never come apart and the clip has never come off since this design feature.
If you are a bit paunchy in the midsection you may want to consider a bit larger waist size than you would normally wear for pants or jeans. Dickies Bib Overalls tend to be a little too small in the mid section when you button the sides. They can be too tight, for some, around the midsection when you sit down. In order to overcome this you have to either go to a much larger waist size or unbutton the sides.
One thing is certain, if what you order or buy does not fit, Dickies has "Excellent" customer service; just return and exchange for a larger size. They stand behind their product. You can purchase with Confidence!