The Seventh Doctor was played by Sylvester McCoy from 1987 to 1989. Initially, they weren't quite sure what to do with his character, since in his first episodes he was a rather benign bumbler, similar to several earlier incarnations. Gradually, though, either the writers or McCoy himself evolved a much more nuanced take on the Doctor -- a skilled tactician, master of psychology and manipulation, but still deeply caring, inquisitive, and humanitarian.
But yes, he did keep the question-mark themed clothing. (Groan.) I do remember watching a few of the Seventh Doctor's adventures on PBS in the early 1990s. It was strange to see another actor besides Tom Baker playing the part, but McCoy pulled you in... it was fun to watch him do his thing, and it always seemed like he was keeping many more secrets than he let on. I missed out on seeing fan-favorite companion Ace, an initially troubled teen who evolved into a skilled warrior.
"A stitch in time... takes up space."
"Anybody remotely interesting is mad in some way."
"There are worlds out there where the sky is burning, and the sea's asleep, and the rivers dream; people made of smoke and cities made of song. Somewhere there's danger, somewhere there's injustice, and somewhere else the tea's getting cold. Come on, Ace. We've got work to do."
The Seventh Doctor is an AQUARIUS. I'm not sure how good the fit is with this sign, since many of its characteristics -- inventiveness, intelligence, loyalty, and unpredictability -- can probably be applied to nearly every Doctor. Was this incarnation also "detached, contrarian, and perverse," as is also sometimes said for Aquarii? I'm not sure. He did once try to teach Ace a lesson about her truant ways by taking her back 100 years to visit the heyday of a grand mansion that she burned down before she met him. A bit perverse, if you ask me... :-)
From the above, it seems that textbook Aquarians are supposed to be coldly objective, with a sarcastic edge. Thus, their New Year's Resolution is to get mushy. No ironic hipster detachment for you! Letting in more emotion may be messy and difficult, but it leads to a richer and more honest life.
[See the introduction for more about sources and motivations for this series of posts.]