I don't think they're actually shin guards... they look more like ribbed or vertically striped socks to me. They don't appear to protrude at all, and the leather knee caps aren't there...
Perhaps it's a slightly later piece, in which the illustrator took some "artistic license" (incorporating some earlier uniform elements). To William's point, the square home plate, Fingerless Gloves and Pillbox Caps suggest an earlier era.
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