There are lots of "expandable" pants now. I have a few pairs of Dockers D3 pants that have a hidden expansion waist band. If I use my IWB they are just fine; I loosen my belt one notch.
IWB goes at about 3:30.
NRA, SAF, ACLDN, IDPA
"Give me liberty or give me death." - Patrick Henry
I'd rather be carried by 6 than caged by 12.