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Pit stains stem from a chemical reaction with the aluminum in antiperspirants. The easiest way to never have to deal with them ever again is to switch to using a non-antiperspirant deodorant.

Hmm I never wear deoderant but some of the white cotton t-shirts I use for light exercise have stains.

Technically there's some medical conditions that make your sweat colored, but I suspect you'd have noticed that more generally...

https://en.wikipedia.org/wiki/Chromhidrosis

Is there a single one of those aluminum-free deodorants that actually works? I've tried about 4 brands, and scent blocking lasts about 4-6 hours. Not good enough.

Good old white-colored old spice (I'm allergic to the blue colored ones) last about 30 hours.

I've had good results with the Arm & Hammer Essentials line: https://www.amazon.com/Arm-Hammer-Essentials-Natural-Deodora...

I gather that body odor is closely tied to your own personal skin microbiome, which might explain very divergent effectiveness of products unfortunately.

The yellow is generally because of the deodorant you're using, not the sweat.

Haven't noticed this with wool shirts -- none of them are white though.