Please help me decide. ChatGPT is useless.
I wish to lose a little bit of weight and especially water (I kind of swell and retain water) so I am unsure which size to keep. It is 92% ribbed cotton and 8% elastan. ChatGPT it can both shrink and loosen...
Here is a comparison of these sizes. S is in the left column, M on the right.

Thank you!
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AI Opinion
For a ribbed cotton top with elastane, Iād keep the size S in your case.
Ribbed + elastane usually relaxes a bit with wear, and if you plan to lose a little weight and water, the S will likely end up fitting just right and looking sleeker. The M may start to feel and look too loose quite soon.
The small size