Why does Drew Seeley wear an arsenal jacket in the high school musical concet?

There's no mention of Drew Seeley wearing an Arsenal jacket in the High School Musical concert. He was not a part of the High School Musical cast.

Here's what is likely happening:

* You might be mistaking him for another actor. Drew Seeley is known for voicing Troy Bolton in the High School Musical animated series, but Zac Efron played Troy in the live-action movies.

* You might be thinking of a different concert. It's possible you're thinking of a concert where Drew Seeley was wearing an Arsenal jacket, but it was not related to High School Musical.

Could you please provide more context or details about the concert you're referring to? This will help me understand and answer your question accurately.