Dressing for “Culture Day” but also not wanting to seem like it’s a costume

So, as the title says, a group I am apart of is having a culture day, where everyone is supposed to dress up in clothing (and other stuff) that shows off the culture.

I am a reform Jew, and while I do have a Star of David necklace that I wear consistently, I don’t have anything else visibly Jewish that I wear. Also, I am an Ashkenazi Jew, so stuff like the sudra seems like it would be too much, I also don’t have one.

I was wondering if it would be appropriate for me to wear a kippah, much like many Conservative and Orthodox Jews do. I’m not going to go the full way, and get some tzitzit, it would just be the kippah. I don’t wear a kippah in my day-to-day life (though I have been thinking about it), and so I don’t want it to seem like I’m appropriating my own culture.

Thank you for the advice!