Here's some bad news for death metal fans wearing their goriest hoodies: don't plan on wearing any of those threads or anything else that might offend fellow passengers on the deck of a Carnival Cruise Line vessel.

Prohibitive policy

The company is dropping anchor on any apparel it deems might be offensive to seafaring customers, said Carnival's Brand Ambassador John Heald, who posted its dress code update on Facebook in December.

The update on the Carnival website's FAQ page spells out the new prohibitive policy as, “items worn during the cruise should not contain any message that may be considered offensive or contain nudity, profanity, sexual innuendo/suggestions. In addition, clothing/accessories should not promote negative ethnic or racial commentary, or hatred or violence in any form.”

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Clothing or expression police

Examples of apparel forbidden on its cruises include anything sexual or suggestive, messages of a racist or ethnic nature, controversial political commentary, nude images, or anything promoting violence or hatred. Otherwise, Carnival's dress code is pretty flexible, aiming for what it calls "cruise casual." The only other apparel that's not allowed is "any footwear with wheels."

"We already have some basic clothing guidelines in place and our guests respect them and understand we are a family-focused business," said company spokesperson Vance Gulliksen to CNN.

It wasn't that Carnival wanted to be what he called "the clothing or expression police," but more of a proactive measure after hearing about tourists in other facets of the industry registering complaints and becoming fearful of other passengers wearing offensive and threatening items.

Inclusive Atmosphere

Most cruise lines have dress codes designed to create a more welcoming and inclusive atmosphere. Carnival's latest update is reportedly prompting its competition to follow suit.

Anyone spotted with such apparel on a Carnival ship won't be forced to walk the plank, however. Instead, they'll politely be asked to change into something more socially acceptable.