0 Both sound correct, it depends if you want to focus on each hat or the group of hats. However, let's put it in the negative:02br 02br 00The baseball players are not wearing (a hat / hats). In this case, "a hat" doesn't sound right.
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00I saw two men working on the field.12blockquote11i00 Each of them was wearing a hat.02i00 (One hat for each man.)02br