First of all, I liked the away team jackets that you saw in the Cage... curiously absent from the next pilot, later brought back sometime in TNG.
The jackets were one of Theiss's experiments with fabric - they were thin vinyl leatherette with the grey foam backing used as the "right side." Unfortunately, the foam turned out to be delicate, snagging and scarring any time an actor brushed up against, say, a plaster "boulder" on Talos.