Based on the order you gave, I suspect your doctor's appointment was the one of the last things you did, and I'm guessing that's when you put your pants on backwards. Hopefully that's the case!

Did you not have to use your pockets at all that day? Or go to the bathroom? Or sit down and notice anything odd? Or feel tags, if they have them?

lol I feel like you would be able to tell by how they felt. I've put mine on backwards and it's pretty obvious

Could have been worse. You could have been wearing pants with the word Juicy on them.

How

Well on the plus side, you wore pants. ^.^

I have days like this sometimes...but come on...at some point either you went to the bathroom, your doctor probably would have mentioned it...did he give you a psych eval? Or someone somewhere at some point would have told you. You didn't look in a mirror to check your appearance before the social appointment and your boss at work didn't question your unprofessional dress attire? It has to be one whopper of a day to honestly not realize. Unless you're the kind of person who nobody would be surprised enough to question had they seen you like this.

What kind of pants were they....?

how did you button up your pants backwards without noticing.

Has to be yoga pants, or legging !!comfy ones- for you not to notice