Hi @themoonspook,
I know it can be a bit annoying to choose different keyword for each product under the floral tshirt category. Since every product will have similar characteristics, choosing a different keyword may sound unusual.
But I’d still suggest you to go with it. You can add a different keyword for every product because choosing the same keyword for 2 products may cause keyword cannibalization in future. In other words, both pages will rank for the same keyword and start eating each other’s traffic.
But you don’t need to pick an entire different keyword for every other page.
You can go with something like “black solid floral tshirt” for one product and “blue solid floral tshirt” for the other. Just an example.
Also, I don’t think that picking up similar keywords for 2 pages would cause any issues(at least in the beginning). But that’s not a recommended practice.
That was my opinion. I hope it will give you some clearance.
Thanks