Material made with Multi / Sub-Object. To replace fabric with leather, simply replace 3 slot with 1.

The same series
Bed - https://3dsky.org/3dmodels/show/krovat_s_karetnoi_stiazhkoi_i_prikrovatnoi_tumboi 
Dresser
https://3dsky.org/3dmodels/show/komod_s_chetyrmia_vydvizhnymi_iashchikami 
Bedside bench - https://3dsky.org/3dmodels/show/prikrovatnaia_skamiaa 

For Corona render, it is recommended to install a version of at least 1.5, since the glossiness of the materials is adjusted taking into account PBR