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 (Jeans + Tee Look)
Jeans
Option 1 (Either wash)
Option 2
Option 3
Option 4 (“Home Laundered” or “Standout DX”)
(Like we discussed, I’d like to keep the jeans a bit more fitted, particularly since we’re going baggy with the second look.)
Top
Option 1 (White, lighter Pink, Army Green, lighter Khaki)
Option 2 (Light Gray or Olive Green)
Option 3 (Pink, White, Brown)
Option 4
(We only want to see about ~2 inches of exposed skin on her stomach, which can be accomplished with either a higher rise of jean, longer length crop top, or both.)
** NEW ** Shoes
(If we go with the brown color top, which would probably be my preference for the color palette, I’m betting that those Birkenstock slides she has would pair well. If not, perhaps just a plain, chunkier/platform white sneaker.)
** NEW ** Flannel
(I think a nice added styling accent would be to tie a flannel around her lower waist for some of the portraits. I would keep it in the brown/tan family and be sure that it is oversized enough that the sleeves will comfortably tie around her hips for a more relaxed feel. This could even be something you pick up at a thrift store, but here are a few options just in case.)
Option 1 (Coffee)
Option 2 (Khaki, Plaid Khaki, C1 Apricot, Coffee)
Outfit #3 (“Clueless” Look)
Skirt
Option 1 (Khaki)
Option 2
Option 3
Option 4 (Pink)
Option 5
Option 6
Top
Option 1 (Baby Pink)
Option 2 (Pink)
Option 3 (Camel or Blue)
Option 4 (Love the vibe of this whole look)
Other Options I Liked
Option 1 (Brown)
Option 2
Option 3 (Any color)
Option 4
Option 5 (Either color)
** NEW ** Top Underneath Sweater
(I really love the idea of doing a white turtleneck or mock neck underneath either of those sweaters you picked. We want it to be more fitted.)
(If you much preferred, we could do a button-down instead. I know that’s what we had initially discussed.)
(If we are doing the longer sweater with the deeper v-neck, you would want this to be very slightly oversized. If we are doing the second, more cropped pink cardigan we want it to be more fitted.)
** NEW ** Shoes
(I’m gravitating towards the solid pink skirt and think a white bootie would be SO cute with this!)
Option 1
Option 2
Option 3
Option 4
(This outfit could also potentially work with white ankle Doc Martens, since you mentioned liking Docs. Although, I gravitate more towards the above options.)
Outfit #4 (Fancy Dress)
Dress
Option 1
Option 2 (The green on green could be really pretty.)
Option 3 (Champagne)
Option 4
Option 5
Option 6
** NEW ** Shoes
Option 1 (Black)
Option 2 (Black)
Option 3 (Black)
Option 4 (Either)
Option 5 (Black, Gold Glitter)
(We want the shoes to feel fancy, but not too mature, especially since the dress is a babydoll style. Trying to keep the heels either block or lower.)
Outfit #5 (Leggings)
Leggings
Option 1 (Heather Gray)
Option 2 (“Lhw010n-l.gry”)
Option 3 (Blue, Light Pink, Gray Heather)
Top
Option 1 (Light Grey, Sky Blue)
Option 2 (Size up for oversized - White, Light Grey, Bright Pink, Sky Blue)
Option 3 (Sky Blue, Pink)
White Socks
(I’d pair these with one of the plain cropped tees or tanks from the first outfit, again only showing the same minimal amount of tummy.)
** NEW ** T-Shirt
With the gray/pink palette of what you chose, I would recommend a plain, white crop tee for this. One of the options from the earlier outfits in white would be great.
** NEW ** Shoes
I think those pink and white high-tops you already have will be perfect with this one!