All in the Family.
Maybe not every episode, but Archie usually wore a white button down shirt and black dress pants while Mike typically sported a blue denim-type button down shirt and jeans. I don’t recall Edith or Gloria sticking to the same outfit.
mmm
Maybe in the 1970s, Castiel was inhabiting the body of Detective Columbo, and decided that he liked the look. 
24
Some small changes sometimes, but since each season is basically one long day…
They do change season to season, tho.
.
John Constantine from the TV show always wears a rumpled trenchcoat, too. He also has a loose red tie and leave the top button on his shirt unfastened.
And, to bring that full circle…Castiel’s look was intentionally patterned after the comic-book John Constantine. 
Bonanza Pernell Robert left the show b/c he got sick and tried of wearing the something all the time
Peter Falk wore the same coat in Columbo
I Dream Of Jeannie
Agreed, and it’s been used as a kind of clue in the new Who seasons: David Tennant tended to wear his brown suit when travelling back in time, and his blue suit in the present or future. Matt Smith may have done something similar with the colors of his bowties, though it doesn’t seem to be as consistent. And recently (staying vague to avoid spoilers), Peter Capaldi switched from his more contemporary outfit to his first, more classic one after plot circumstances made that appropriate.
John Reese in Person of Interest
Tonto in The Lone Ranger. (The Lone Ranger is in uniform.)
No one’s mentioned Matlock yet? (Homaged on “Better Call Saul”. http://assets.nydailynews.com/polopoly_fs/1.2139864.1425659715!/img/httpImage/image.jpg_gen/derivatives/article_970/better-call-saul-season-1.jpg)
Oh yea, that’s a good one.
I never watched it enough to notice.
I’m not sure 24 should count.
On “The Big Bang Theory” the guys all wear variations of the same outfit:
Leonard with the hoodie and jacket
Raj with the t-shirt, button-up shirt & sweater vest
Howard with the turtleneck (actually a dickie), button-up shirt, tight colourful jeans and belt buckle
Sheldon with the t-shirt over a long-sleeve shirt
…I always wondered how damn cold it is in California because they’re dressed in so many layers.
Even the girls have their own signature looks: Bernadette with the full skirts and tight knit sweaters and Amy with the long, frumpy skirts, high-necked blouses & cardigans. The only character with a range of outfits is Penny.
nm
Second linky no worky.
Here are a few others (a lot of the image files I’m finding seem to have weird extensions on them):
My Three Sons similarly, because Fred MacMurray’s contract allowed him to film multiple episodes of his shots all in a group to minimize his studio time.
Bonanza did it so their collection of outdoor/location shots could be used in any given episode.
There are a lot more than I thought. Like My Three Sons. Never noticed that one.
I knew Columbo’s raincoat, of course, but I guess I figured he wore different stuff underneath. He did take it off once in a while.
Land of the Lost
Mork and Mindy - those suspenders!
Did the Sweathogs ever change clothes?
The Adventures of Brisco County, Jr.
Brisco always word the same outfit - unless in disguise. Blue shirt, red kerchief, light brown pants and jacket.
As in Happy Days, in one scene they showed his wardrobe as he was changing and it was all the same items.
Interestingly, Peter Falk was his own costumer; those were all his own clothes.
