Being primarily lycra, they stretch pretty well. My only issue has been the jerseys. Thankfully, most vendors will have sizing charts. Aerotechs line for big men tend to run "true size." If looking at other vendors, get club cut, which will still be smaller than normal. Race cut is for bean poles. I think bibs (and shorts) tend to run "normal" sizes as opposed to jerseys. Aerotech's sized will fit up to a 56" waist.
[TABLE="class: sizechart, width: 100%, align: left"]
[TR]
[TD="colspan: 9"]Aero Tech Designs Bib short Size Chart[/TD]
[/TR]
[TR="class: men"]
[TD="class: style29, width: 15%"]Size[/TD]
[TD="width: 10%"]Small[/TD]
[TD="width: 10%"]Medium[/TD]
[TD="width: 10%"]Large[/TD]
[TD="width: 10%"]X-Large[/TD]
[TD="width: 10%"]XX-Large[/TD]
[TD="width: 10%"]3XL[/TD]
[TD="width: 11%"]4XL[/TD]
[TD="width: 14%"]5XL[/TD]
[/TR]
[TR]
[TD="align: left"]Waist (inches)[/TD]
[TD]28-30[/TD]
[TD]32-34[/TD]
[TD]36-38[/TD]
[TD]38-40[/TD]
[TD]42-44[/TD]
[TD]46-48[/TD]
[TD]50-52[/TD]
[TD]54-56[/TD]
[/TR]
[TR]
[TD="align: left"]Inseam (inches)[/TD]
[TD]8 3/4[/TD]
[TD]9 1/4[/TD]
[TD]9 3/4[/TD]
[TD]10 1/4[/TD]
[TD]10 1/2[/TD]
[TD]10 3/4[/TD]
[TD]10 3/4[/TD]
[TD]10 3/4[/TD]
[/TR]
[/TABLE]