Disclaimer: Doctor Who isn't mine. If it was things would be quite different. The BBC owns all and I bow before them.

Partially inspired by The Lazarus Experiment, my headcanon is that the Doctor never wears a tuxedo in Pete's World until he marries Rose.

The Doctor frowned at the mirror during his fitting. The tuxedo looked dashing on him, but the thought of wearing it on the happiest day of his many lives filled him with dread.

"What's wrong?" Jackie Tyler asked.

"The suit. Bad things always happen when I wear a tux."

She gently patted his shoulder. "But this is Rose, you plum, and anybody who thinks about causing trouble at my daughter's wedding has to deal with me."

He laughed in agreement. Perhaps it was time to make it his lucky suit, the one he wore as he became Rose Tyler's husband.