First Rosh Hashanah

Silly question and months away— I’m in the process of converting and this year is going to be my first Rosh Hashanah in a Reform Temple. Been trying to figure out what to wear, and google has been less than helpful. Some sources say white, others say fall colors. All say white and no leather for Yom Kippur so that part I have figured out.

So, beyond modest, what should I put on as a woman?

Also, my adult son (who plans on converting too, just hasn’t started) plans to join me. What’s the male dress code?