I have the X shears as well, 3 years old and still the best shears ever. Better than my raptors.

X shear has a plastic holster: https://www.amazon.com/dp/B07MZ8RKFB/ref=cm_sw_em_r_mt_dp_aADUFbRM2PDDC

I was given a leather one, I soaked it in water to stretch fit it. It was similar to this: https://www.amazon.com/dp/B078MDS31N/ref=cm_sw_em_r_mt_dp_hCDUFbKY73XW8 Didn’t like it on my hip.

In the end I just stick it in my radio strap, secure enough and handy.