dan613, 
If you are thinking of trying mushroom (mycelial) leather for yourself, this paper (https://www.cambridge.org/core/journals/research-directions-biotechnology-design/article/growing-mycelium-leather-a-paste-substrate-approach-with-posttreatments/8B0BAD4C1481BDE26583408B4FAA9D13) has most of the steps you need. However the tensile strength is quite low, being around 1 N/cm², with cow leather being around 800 N/cm².
Another approach is bacterial cellulose, using bacteria found in kombucha. Adding mushroom protein and processing with glycerol gave similar results to leather. https://www.researchgate.net/journal/Cellulose-1572-882X/publication/349108621_Comparative_study_on_the_physical_entrapment_of_soy_and_mushroom_proteins_on_the_durability_of_bacterial_cellulose_bio-leather/links/6020cf4d92851c4ed557992d/Comparative-study-on-the-physical-entrapment-of-soy-and-mushroom-proteins-on-the-durability-of-bacterial-cellulose-bio-leather.pdf
I haven't seen studies on using a fabric mesh (cotton, linen, or hemp) to improve strength.
Thanks to @deborahh and @richard for the original posts.
#VeganLeather #MushroomLeather
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