Stains… kinda weirdly specific and gross question

What are the stains on Curly’s gown meant to be? Is it just a style choice and dried blood? Or weeping fluid from injuries so a sort of desaturated blood/lymph? vomit? General filth due to lack of supplies and crew a mixture of apathetic and/or aggressive towards him for believing he crashed the ship, or focused on their own problems

Not trying to be absolutely gross but wondering this way more than I should be.