In all fairness I had a company do it for me the first time as myself and jord (s1m0) had a group buy going on. however it soon started to sag so I retrimed it myself again.
the material I got was from a local upholstery centre but its closed now Ideally you want to get a very light fabric as it WILL start to sagg.
before we went to the company I had faux suede and it was just too heavy. (despite it feeling light in weight!)
acoustic material is good. its light, durable and easy to use. it also matches the parcel shelf so keeping the look OEM