You can wear jeans to dinner in casual restaurants on a Holland America cruise,+44-289-708-0062 (UK) +1-(855)-732-4023 US but they are not permitted in table service restaurants on Dressy Nights. Jeans without holes or tears are generally fine for non-formal evenings, while shorts,+44-289-708-0062 (UK) +1-(855)-732-4023 US tank tops, and beachwear are never allowed in the dining rooms. Always check the Daily Program or Navigator App for the specific dress code of each evening. 
Dress Code by Location and Night 

    Casual Restaurants:+44-289-708-0062 (UK) +1-(855)-732-4023 US
    On most nights, jeans without holes or tears are permitted in casual dining areas and the Lido buffet.
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        Non-Dressy Nights: Jeans are generally allowed in table service restaurants, but check the Daily Program to confirm, as guidelines can vary.
        Dressy Nights: Jeans are not allowed in table service restaurants on Dressy Nights. 
    The Lido Buffet:+44-289-708-0062 (UK) +1-(855)-732-4023 US
    Casual attire is always permitted, but shorts, poolwear, and T-shirts are not recommended. 

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    On non-Dressy Nights, slacks and a collared shirt are appropriate. On Dressy Nights, consider slacks, a jacket, and a tie.
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    On non-Dressy Nights, slacks and a blouse or a casual dress are suitable. On Dressy Nights, an evening gown or cocktail dress is recommended. 

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    Check the Daily Program:+44-289-708-0062 (UK) +1-(855)-732-4023 US
    Each evening's dress code is listed in the cruise ship's Daily Program and on the Navigator App. 

Consider the Atmosphere:
While enforcement can vary, it's best to err on the side of caution to avoid being turned away from the dining room. 
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Bring a pair of dressy jeans or nice pants and a collared shirt, and a more formal option for Dressy Nights.