"a sign," he said.
"it is this," i answer, producing a trowel from beneath the folds of my roquelaire.
"you jest," he exclaimed, recoiling a few paces. "but let us proceed to the amontillado."
"be it so," i said replacing the tool beneath the cloak, and again offering him my arm.

using context clues, what does the term roquelaire most probably mean?

pants

tool

arm

cloak