How do I get that wide, pillowy chorus sound like RÜFÜS DU SOL's "You Were Right"?

Record the same part twice, pan one hard left and the other hard right, then nudge one track about 10–20 milliseconds later. The tiny timing offset creates a natural doubling effect that’s wider than a stereo chorus plugin but not so wide it sounds like two different takes. Keep both tracks dry or use the same reverb send — the magic is in the milliseconds, not compression or extra tracks.