More colors, more fancy embellishments, more fashionability or trendiness business casual is a minimal fashion environment, so the more extra it is, the less likely it is to fit the mood
Its a delicate balance to dress appropriately to a formal event, but the thought put into it is quite literally a way of showing respect and enthusiasm to the host who is planning and coordinating the event.
Your casual dresses will be those that look good but which you can be spontaneous wearing for instance, a casual dress might be suitable for popping out to the shops, or going for a walk around the park, or sightseeing, or lunch with friends
My favs are the first pink/berry one, and the Lilly maxi (the blue), and the Lilly one with UPF, and the reversable dress
Curve-hugging yet comfortable fit
The key is to take aspects of both categories that you lovelike luxe blazers and silky fabrics or A-line dresses and dance-floor-ready heelsand throw em together without thinking too hard about it