I am using Nappa leather sleeves made in Germany by fitBAG since many years:
https://www.fitbag.com/beat-black-custom-tailored-phone-sleeve
You can order the fitBAG sleeve slightly larger so that your Pixel also fits in with a case.
This company produces these bags for all possible device sizes, including tablets, for example.
Everything is handmade and customised. And with very good service.
And with fair prices.
This is not an advert. But I have been a regular customer there for about 15 years.
When I buy a new smartphone, I also order a sleeve for it from fitBAG if the previous sleeve no longer fits.
Otherwise, I can continue to use the existing sleeve, because they are durable.