Reformation is really the best. Their clothes are pricey but incredibly well made. Just make sure if they instruct you to not wash something: do. not. wash. it. They even recommend hand washing vs. sending it to the dry cleaners. All of their clothes are made from recycled fabrics (#sustainability!) so they do require some extra care.
Their pieces usually run true to size. My only complaint is that I bought a maxi from there and it’s an awkward length. I’m 5’4 and it just grazes the bottom of my ankles. Normally I would’ve worn a dress like that with heels but because of this length I can’t.