Krusell Vintage Nude Leather Case ($32)
Krusell makes some of the best genuine leather snap-on cases for phones, and its Vintage Nude series for the OnePlus 6T looks great.
If you want a leather case but you're also worried about the effects of leather, Krusell uses a sustainable manufacturing process that everyone can appreciate. There's a hard polycarbonate skeleton, hand-made leather, and a soft microfiber lining on the inside to keep the glass-back of your phone safe. It's a nice case that will look, feel, and smell stylish.