"Q. What is the best way to dress for a day at the parks?
A. The parks are a casual, family-oriented environment. We suggest you dress comfortably, wear good walking shoes and check the local weather report before you leave for the parks. Ensuring that the parks are family friendly is an important part of the Disney experience. In that spirit, we ask you to use your discretion and common sense. Attire that is not appropriate for the theme parks (and which may result in refusal of admittance or ejection) includes but is not limited to:
- Adult costumes or clothing that can be viewed as representative of an actual Disney character (unless you are dressing up for a particular event that allows costumes)
- Masks (unless you are dressing up for a particular event that allows masks)
- Clothing with objectionable material, including obscene language or graphics
- Excessively torn clothing Clothing which, by nature, exposes excessive portions of the skin that may be viewed as inappropriate for a family environment
- Tattoos that could be considered objectionable, such as with obscene language or graphics
A Guest is allowed into the parks if her or his hair (or make-up, if applicable) has been made to resemble a Disney Princess or character (for example, a child after a Bibbidi Bobbidi Boutique makeover) provided the Guest is not also wearing a costume or clothed to look like the character."
Source:
https://disneyland.disney.go.com/faq/parks/dress/
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