Grey, red, and black.
My Top 3:
1. Frank Miller's classic red
2. Tim Sale's revisionist yellow
3. The track suit from JRJR
The Chichester/McDaniel armored costume.
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Classic red
Daredevil #7 Apr 1965
"In Mortal Combat with Sub-Mariner!"
Prince Namor hires Franklin and Murdock to sue the human race on his behalf. When this doesn't work,
he gets himself arrested so he can have his day in court.
Realizing humanity won't listen, the Sub-Mariner goes on a rampage which brings Daredevil into the (hopeless) fray.
Namor returns to the sea out of respect for DD and to stop Krang from taking over Atlantis.
NOTE: First appearance of Daredevil's red costume.
Written by Stan Lee. Art by Wally Wood.
Sub-Mariner/Daredevil pin-up by Wally Wood.
Modern red.
Specifically as drawn by Marco Checchetto.
I'm partial to his OG yellow suit, but I think I like his Gang War semiarmored suit best.
I really like the suit that began this current run (that I'm pretty sure he'll be returning to in the next few issues).
Keep in mind that you have about as much chance of changing my mind as I do of changing yours.
The redesigned Daredevil suit that came out in DD #21 would be a great choice at this point, too.
The spider is always on the hunt.
Personally I think the only good costume he had was the red. I never liked the originally blackish red and yellow costume. And then there was that 90's one. That must be why they keep going back to it or at least close variation.
Classic Red.