Buffy the Vampire Slayer was the one in the short skirts and low-cut tops kicking vamp butt, but I prefer Giles' fuddy-duddy, old-man English style. Look at him looking all dapper! He wears vests! And worriedly takes off his glasses! He looks like he smells like old books and earl grey tea.
The polka-dotted tie is a personal favorite of mine. Being a little whimsical, Giles? How out of character!
And he totally switched up his look when a spell turned him into his younger self -- Ripper, the punk/criminal/sexy-pants. A white T-shirt is always a fabulous look. Especially when accompanied by a James-Dean attitude.
I must admit, however, that Giles does not always look fab. Sombrero? Not so much. Although, everything is forgiven on Halloween.