Here are links to options for each of the missing pieces. You definitely don't need to get these specific items and can just use them for inspiration, but the links are also here if you'd like to simplify things and just pick from what I've linked to.
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Outfit #3 (Casual)
Like we talked about yesterday, I really like the vibe of this outfit.
I’d love to do something similar but tweak it slightly…
Same pants (or a new pair of the same or something similar)
All white scrunchy socks
Those shoes could work, and I love the little purse coordinating with them
A solid white t-shirt instead of black to break it up a little bit
A jacket - either light wash denim, white denim, or a bomber/varsity style