Did you change clothing during your IM?

I did a full change S-B and B-R. 

I went with bibs and a full-zip jersey because I didn't want to get burned on my lower back (turns out it was cold and overcast, but I was already committed to that solution before the weather was forecast).  It wasn't hard to put the jersey on (I wanted the full-zip so it'd be easier to make bathroom stops).  I wasn't fast in T1, but it wasn't because of the jersey. 

I changed into running shorts and a tri-top for the run (along with fresh socks).  I had a running singlet, but the temps were about 60F and rain was threatening so I opted for the tri-top.  In hindsight, I should have kept the bike jersey (I'd injured my shoulder on the bike and wasn't relishing the prospect of moving my arm enough to put the top on, but I wasn't thinking real clearly at that moment, so I went for the pain and suffering. 

I'm training for my first and I'm planning on changing for each discipline.  I'll be more comfortable in a high end pair of bike shorts and I want to put some nutrition and a spare tubbie in my jersey.  I figure I might as well run in running shorts since I'll be changing.  If I was hoping to go real fast I would wear the same clothes, but I'm in the over 12 hour crowd and I might as well focus on comfort.

It was a little chilly at FL last year so I put arm warmers on for the bike. The sun goes down early so I put on long sleeves for the run.

I know I am going to get laughed at but I am an IM first timer and I have to ask because I am curious.  I am thinking about changing shorts between b/r, but when I train I don't wear underwear.  Do people just strip down to nothing and change or what is the protocol for this??

No laughing here - that is a legitmate question. There are separate male and female change tents at most IM races - and no one is very interested in anything but their own space. So you just pick a chair and change to whatever extent you want.

** but best to move away fromthe open door-flap before starting to strip down.

Desoto tri shorts and top from start to finish.

NO I did not change : Sports bra, tri top and tri shorts +/- various layers (AKA arm warmers etc)  2 IMs

YES : people get totally naked in the changing tent

People get all concerned about changing into dry stuff after the swim.  Before you choose that option take a shower and try to put on a sports bra when you are 1/2 dry...ITS REALLY REALLY HARD.  esp if you have breasts and are not flat chested but even the flat chested chicks were struggling.  Add in a dark crowded space in total chaos. 

Sherri (oliveveiw) has been the team captain for the IMFL womens changing tent for a few years. She says KEEP IT SIMPLE.  The pros have almost nothing in their bags.  We all know IM is going to hurt and people want to do everything to make it hurt the least amount possible.  My theory is I am going to get soaked with sweat on the bike anyway why bother change?  I train in tri shorts for the bike-run all the time so its not a leap for me. I don't even own any bike shorts. Like they say train like you race   See ya there

I was amazed at the people who run 26 miles in spandex!  I took me 30 seconds to strip off my biking shorts and put on running shorts.  I actually got a comment from two spectators who said "Hey, here's a guy who's wearing running shorts!  Thank you!  We're sick of seeing all the spandex!"

~Mike

I have actually thought about changing into run shorts for the run, sine I do all of my long runs in running shorts, but I chafe in running shorts a little too much for my liking, where spandex I don't. . ..so spandex it will be. 

I change in T1 and T2 and my Transition times are on par or a little faster than others.  Just go in with a purpose, get naked if need be, get done what needs to get done and get out. . . . .