Hello Eagle Squadron,
Welcome to the forum.
Early para wings were issued on khaki and black backings in a rectangle shape. There was no significance to the backing colour, it was just how the wings were produced by the manufacture. In 1940-41, official correspondence was issued stating that the wings were to be issued on a khaki background, however wings continued to be produced on black backing. The wings were sometimes applied to the uniform in the rectangle shape and also trimmed down.
Attached is an early wing on a black ground that has been trimmed down and padded.
I hope this helps.
Paul
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