Wow, what an interesting (and unusual) question. I’m not a big fan of hypotheticals because they will never happen, so I have to think about something that’s impossible. Perhaps we should say instead, “What’s your favorite outfit?” On that level, I guess it’s my standard workday outfit, which is slacks, an Izod- or Polo-style shirt and comfortable shoes. It works at my workplace, it’s usually good for eating at a restaurant and it’s a nice outfit to wear to church on Sunday.
Forced? Well, the only way I’ll ever be forced to wear the same thing every day is if I’m convicted of something and sent to prison. Since I don’t anticipate that ever happening, I’ll settle for the outfit of choice, which works for me and most people.