Hi @pinsonmain ,
I have an effective solution for your issue using the Easify Product Options app. Here’s a quick demonstration on how you can set it up 
:
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Create your “Pajama Set” as a regular single product, but don’t include any options or variants.
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Create “Pajama Top” and “Pajama Bottom” as 2 separate products, and include size variants for each (e.g., S, M, L).
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Install the Easify Product Options app and create a new option set:
- Add an option for customers to choose a Top Size, using the Buttons option type, including 3 option values, and select associated product variants of the “Pajama Top” product (S, M, L) for each option value. This will automatically update the variants’ labels (and quantities) to the option values.
- Similarly, add an option for customers to choose a Bottom Size, using the Buttons option type, including 3 option values, and select associated product variants of the “Pajama Bottom” product (S, M, L) for each option value. Again, the variants’ labels (and quantities) will be automatically updated to the option values.
- After creating your option set, assign it to the “Pajama Set” product that you created at the beginning, and you’re done!
Give the app a try and see how it streamlines your product options for a better shopping experience 
.