There is nothing in the rules that prevents a pitcher from wearing a helmet / skull cap type protector.
Rule 1.11 does not currently prohibit the use of a helmet. It only says that "Uniforms" are identical in Color, Style, & Trim.
Rule 1.16 does not say a pitcher or fielder should or should not, only certain players: catchers, batters, runners, and base coaches are required.
John Olerud Jr wore one while playing 1st base for years.
The only pre-requisite should be that the surface is "non-glare" if the pitcher chooses to use a helmet.
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