It’s been a while since I watched it. I believe the implied story reason is that the red suit was too damaged by the S2 finale to keep wearing it. Correction: too damaged by the Defenders sequence between S2 and S3.

The practical reason is that S3 introduces another character that wears red, and they wanted it to be easier to distinguish who’s who in dark environments.

You shut off a shakycam bootleg with terrible audio?

Oh, I wasn’t saying it sucked. I just haven’t heard about it much lately and I remember it from the '90s, which was a long time ago.

Saturday Night Live is still a thing?

Wait what there’s a Halo show?

Making your own would be much cheaper. Custom silicone mold?