appear in
1. To wear a particular outfit or accessory in public. I don't want to appear in a gown if all of the other women are in cocktail dresses.
2. To act, as in a play or movie. My agent has been getting a lot of calls about me ever since I appeared in Wicked.
appear in something
1. to be seen in some performance. The singer will appear in the opera with the rest of the chorus. I will appear in Aida.
2. to be seen wearing something. I wouldn't appear in that in public! Would you want to appear in a wrinkled suit?