I ordered a bunch of insulated coveralls and bib overall to compare.  I am 6'8" tall and these fit the best of the coveralls I tried.  I liked some features of them but the zipper on the side didn't go all the way up which make it harder to put on with shoes on.  Also the insulation on the bottom of the leg didn't go all the way to the bottom.  The bottom 6" of the pants don't have insulation in them.  But they were better than the Carhartts and the Polar King by Key Apparel Premium Insulated Bib Overall.  I liked the construction of the Polar King the best but the inseam of it was way too short.  It was only 31" and that was the Large Tall but it was NOT tall.  I wish the legs were longer and I would have purchased it.  The crotch was 1/2 to my knees.  So I decided to go with Dickie Insulated Bib Overalls as they fit better with at least 34" inseams.  The Carhartt had 36" inseam and fit the best but the bib on the Carhartts is not insulated and the Bib on the Dickies was.  Also the Dickies have zippers going all the way up the side which make them really easy to get on and off.  The Carhartts only go up just above the knees and it is hard to put them on with shoes.  So I went with the Dickies Men's Big-Tall Premium Insulated Duck Bib All but these Wall's Coveralls were the best of the coveralls.  Just not long enough on the inseam.  The inseam was only 31" maybe 32."