With respect for the importance of these days, wear whatever allows you to feel comfortable, open, and present. We encourage you to suit up with any ritual gear that is part of your religious practice. We don’t provide prayer shawls but we do have cool kippot.
Pro Tip: Most people glam up on Rosh Hashanah night, and throughout Yom Kippur some prefer to wear white and abstain from leather shoes…or footwear in general.