Here's my story...
A few years ago, a customer came into my store looking for a suit. I found one that he liked and marked it for alterations... except that I forgot to mark the pants for the length! I didn't realize my mistake until about an hour or so after he'd left the store. Making matters worse, he lived an hour away.
I spent the entire evening in a panic trying to figure out how I was going to fix the situation without having to have him drive all the way back out to get measured. Eventually, I noticed that my coworker was almost the exact same size. I asked him to try the pants on so that I could measure him and mark the pants. I never heard anything about it after that, so I'm guessing it all worked out.
"But why didn't you ask the manager what to do?" Yeah... about that. See, the thing is... I WAS the manager on duty when this happened!