You picked the right category of vehicle, because panzerjaeger units kept constant their colour of waffenfarbe - pink. The shoulder straps would have the cypher 'P', either in pink embroidery, silver or gold depending on rank.
From February 1942 to May 1944, crew uniforms should be the field grey version of the black panzer type. After the latter date, they were suppose to revert back to the black uniform. Also during the second half of the war, branch piping around the collar lapels was eliminiated, as was the coloured soutache on cloth headgear.
regards,
Jack