Just to add to the discussion...
I believe those were not "real" Masami colors. Masami was already sporting his multicolor flaming on green when he came to Romsey (87 WC). He was driving the original short Cat, the Schumacher team gave him the latest Cat XLS (or was it an XL ?).
Anyway, this is a legendary paint theme and Masami did won his first WC with it !