[pct-l] shoe sizing - questions thereof

[greg mushial]

In reading Yogi's PCT handbook, it seems the suggested shoe size (for 
running shoes) is 1/2 to a full size over one's day-in-day-out shoe size. My 
question is: is that for people that wear confining shoes on a daily basis, 
and it's with all the trail pounding their feet broaden out to their more 
normal dimensions; or is that for everyone? The reason I ask is: as someone 
that lives in sandals and/or flipflops (have one reconstructed foot and 
normal shoes hurt to wear on a daily basis, especially sitting at a desk in 
the office), as such, my feet have become quite broad. Should I expect them 
to become even broader on the trail, ie, when I buy a new set of runners, 
should I also plan on buying large. [and not to worry: the best therapy for 
the reconstructed foot has always been walking - doesn't hurt in hiking 
boots...  but would like to try running shoes for a section hike...   also 
of note: in previous hikes (50 milers etc) I've never noticed any 
enlargement (other than from altitude, eg, over 15k ft), and am wondering if 
I simply haven't walked far enough to see this effect.]  People's comments, 
please.
thanks, TheDuck