Wedding gift for stepchildren?

Hi friends! My fiancé and I are getting married in September. He asked me a few weeks ago what I was getting his children for the wedding… I was floored as I thought me as stepmom was gift enough 😂 I have not even thought about gifts for his children and it is not something I had heard of before. I think getting them their outfits is enough, but maybe I am wrong or missing some tradition. Did you all give a gift to your stepchildren when you married their parent? It feels strange to me as it is our marriage and his son is 17 and his daughter is 16. Any guidance you all have would be greatly appreciated as this is my first marriage! Thank you.