GR translation: plausible items

[Mike Jing]

V367.21-25, P373.15-19   They decide on an intricate system of disguise.
Säure gives Slothrop his jacket. Trudi wears the green cape. Magda puts on
Slothrop’s boots, and he goes in his socks, carrying her own tiny shoes in
his pockets. They spend some time gathering plausible items, kindling and
greens, to fill the helmet with, and Säure carries that.

What does "plausible" mean here?