Albus vaguely wondered why he kept using his full name like that, but put it aside for now. Instead he nodded and reached for his wand. Letting the bag fall with a dull thud and a series of annoyed squeaks, he undid the clasp on his cloak and pulled it off, revealing the simple shirt and braces beneath.
A few flicks of his wand and a mumbled spell, and the cloak squirmed and morphed into a pair of trousers. Albus held them out. "If you'd like to get those on, I can make you a shirt from the sheet."
Once he'd handed the clothing over, he turned away and picked up the bag, heading to a nearby window. Keeping his back to allow the other wizard some privacy, the Professor waved his wand, causing the glass to vanish, and pulled open the drawstring. The doxies squealed and began to flutter, and Albus just about held them out in time for the creatures to vanish out the window and fĺy chattering into the morning sky.
Albus turned back, shoving the bag into his pocket. "Ready?"