. Here's some photos of 38 Cabriolet interiors I found on line. . The first photo appears to be original vehicle with correctly replaced seat covers. . The second photo shows correct E-brake lever but wrong transmission and AC. . The third photo shows optional Deluxe banjo steering wheel but has automatic trans and 37 dash color. . There were two nice 38 Cabriolets at the National Tahoe show in 2016. The black one is owned by Randal (??) entry number #335, license #594-Z. . The Blue Cabriolet, License #APG6228 rear and #50C4 front, may belong to Dean Echols, Tech advisor. . Lou .
. Closed cars like Sedan, Coach and Coupe had Mohair. Cabriolet had "Moleskin" which is like naugahyde. My Tourer has leather and Sedan Delivery has Coach seats with Moleskin. On the right side of the cowl is a Fisher body plate below the ViN, that gives the number of the trim. . .
If you do a search there has been 1938 Cabroilet interior infromation discussed at length several times in the past. The seats were plain brown leather door panels artifical leather if I remember correctly.
I have never seen a 1937 or 1938 with Mohair, except in the picture above, and I have seen several over the years. Also in a coupe with a rumble seat, they were also leather.