Depends on how formal you want to be..
A Dad would normally wear a suit and tie and Mom would wear a dress.
Hope this helps.
There is usually no ceremony but you are a HS grad since it's equivalent.
It depends on the season and how formal the school is, but dressing in professional but celebratory clothing is probably a safe bet for parents.
I think it depends on your parents. I would say about 3-4 inches
Yes, they do. A simple Google image search will reurn some pictures of them at a recent awards ceremony with their parents.
No,you dress the way you want to.
A distinguished professor should wear a conservative, yet elegant, go to a ceremony.
The parents
When choosing a grad school graduation dress, consider the dress code of the ceremony, your personal style, comfort, and appropriateness for the occasion. Opt for a dress that is classy, fits well, and makes you feel confident.
When my daughter, Kristen, graduated she wore comfortable pants and a shirt under her grad gown. Some of her classmates wore dresses and others wore shorts! There is no rule for what you must wear under your graduation robes! Let your plans for the day dictate what your "under grad gown" outfit will be. You, of course, want to be comfortable, so choose an outfit that's not too big, bulky or hot. Your graduation ceremony could last quite a while so you want to make sure your not in a very hot or ill fitting outfit. That will make the graduation seem even longer! If you are going to a party right after your graduation ceremony, what kind of party is it? Formal or informal? You will want to dress in an appropriate fashion. Bottom line is dress how you feel comfortable, but make sure your outfit isn't too sloppy. This is your graduation...you want to look your best!
For a grad school interview, it is best to wear professional attire such as a suit or dress pants with a blouse or button-down shirt. Avoid casual clothing and opt for conservative colors and styles to make a good impression.
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Yes, graduate students may wear cords during their graduation ceremony to signify academic achievements or membership in honor societies.