Shorts for big boys

Hello all! Been training for a while now, and thinking of competing. I’m a “big boy” (5’11” 350lbs w/44” waist. It’s very clear that “Thai sizing” is much smaller than std US sizing. Does anyone know a brand that sells traditional Muay Thai shorts that large? I found a website called “Muay Thai Factory” that offers custom shorts, but it almost seems too good to be true. Has anyone used that site or have other recommendations?