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 #1 (Athleticwear)
Two-piece coordinating outfit with scrunch socks and sneakers
Set
(This is a link to the one we used in my recent shoot that I showed you. The actual color of the outfit was much paler than the product photos. Because of this, I would probably go with the black one.)
Scrunch Socks
Outfit #2 (Plaid Peplum Top + Jeans)
Slip-on Sneakers
(You could get real ones at the Vans outlet like you mentioned, but Amazon also has tons of generic ones like these if you’d prefer to go that route. Would definitely go for solid white for these.)
Outfit #4 (Two-Piece Polished Casual)
Set
(If there is any way that Libbie would do the hot pink one, I think she would look SO stunning in that color. But, the blue is also totally fine if it’ll kill her vibe that day to wear pink.)
Jacket
Option 1 (“Ombre - Blue,pink” would look great with either color outfit)
Option 2 (Yellow would look great with blue set, Purple with hot pink set)
I can recommend shoes once you let me know what combo you’ve decided to go with.