“In true fashion” is a phrase used to describe something done in a characteristic or typical way, especially when referring to someone’s usual behavior, style, or manner. It often carries the implication that the action or event is in line with expectations based on that person’s or group’s established habits or traditions.
For example:
He arrived late, in true fashion, suggests that arriving late is typical behavior for this person.
The team won the game in true fashion, might mean they won the game in the usual or expected manner, possibly with their signature style or strategy.