Here is what the full cast will be wearing for each of the numbers.
Seize the Day
"Newsies" outfits: button-down plaid shirts (rolled up to the elbow), suspenders or vests (neutral colours), slacks/khakis or capri-length rolled-up sweatpants (preferably slacks), newsboy caps if you have them.
Boys: dress shoes only
Girls: character shoes only
Clothing such as this would be ideal:

Research "Newsies" to get a better understanding of what you should be wearing.
The River Won't Flow
Jeans, blue top (t-shirt, sweater, cardigan, button-down, etc., can be layered and multiple shades of blue), neutral/darker shoes.
All That Jazz
Boys: Black long-sleeved button-down, tie if you want (must be red [see below] or black), black dress pants, black dress shoes.
Girls: Dressy, all-black. Cannot wear skirts/dresses without black shorts underneath. Character shoes. Preferred costume: black shorts (must be tight) with tan leggings, black shirt with sleeves up to the elbow or less (less sleeve is okay), character shoes. Girls not dancing as much or intensively can wear dresses. Dress to what your choreography allows or requires.
All: If you'd like (not everyone is required to), you can add one red accent to your costume. This can be in the form of, for example, a tie, a bracelet, a necklace, earrings, a headband, etc. This red needs to be a saturated red. If you are unsure about your red accent, ask Liam, Ajit, Darius, or Shaina.
Louder Than Words
School clothes: dark or muted (avoid light, pastel, or bright colours) school clothes (does not have to include jeans).
can include: jeans, leggings, sweaters, button-downs, scarves, etc.
No clothing should include writing or imagery (brand names, logos, other pictures, etc.) of any sort on it. Black socks with everything (unless wearing tights obviously).
If you are unsure if your costume for any of the full cast numbers is acceptable or simply want to be double-sure, do not hesitate to ask Liam, Ajit, Darius, or Shaina. It is far better to make a change now when you have time to find a new costume than for us to see it on Super Sunday and make you change it then.