At #3: The Ruched T. Either as a regular tee or a t-shirt dress, ruching allows a fitted cut while expanding with the growth of the bump. In fact, it's even flattering post-pregnancy when there's still a few pounds to shed!
This easy and fail-safe stable is definitely a no-brainer. And if I factor the cost-per-wear, it's really worth investing in a good quality stretch jersey that can survive the weekly wash&dry.
T-shirt - H&M; Skirt - Alexander Wang; Pumps - Miu Miu; Hat - Zara; Scarf - Hermes; Necklace - Street Vendor