The piece of hessian you refer to was known as a Holland Patch and was worn (IIRC) behind the badge and coller knots. Iy might be worth contacting the Staffordshire Regiment museum about getting a beret and patch
The Holland patch was awarded for 57 years continuous service in the Dutch East Indies. The cloth is the local material that the soldier had to make thier uniforms from during this period. The Stafford Knot is by tale to hang three men at once. The feathers are the the Prince of Wales Plumes and the motto Ich Dien means "I serve" Happy to help.
The Prince of Wales's feathers are from the pre amalgamation North staffords badge and the Holland patch from the South Staffords> I'm not sure about the regular battalion but for a short while in the 60s the TA battalion wore the double headed saxon badge that is now being worn