It is said that the PWS factory used the FS 30097 Khaki I for their planes.However the colour in the pic is the FS 30118 (RAL 7008) PZL Khaki I. The colour was found during her restoration under the plane nameplate.
The Tamiya equivalent for the colours can be :
FS 30097 - XF58
FS 30118 - XF64