Is the outfit of the Tusken Raiders based on World War 2 gas masks.?
This picture from 1941
Looks suspiciously familiar.
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Your question is based on a false premise. That photo is not of gas masks from WW2. It is from a site called "How I remember it" which contains doctored photos. Here is the link to yours.
Here are another couple of sci-fi examples from the same site:
Real children's gas masks look quite different: