Most cheap polarized sunglasses have a weak effect, barely noticeable compared to even a basic CPL filter.
To fix this, I designed a custom frame for 58mm CPL filters.

You'll need a printer with good tolerances and an understanding of your filament's shrink factor (CPL filter threads can be tricky). If the filter doesn't fit after printing, gently bend the frame to pop it in and adjust the rotation.

All in all, you'll need PETG, 2x 58mm CPL filters, 2x 16mm M2 bolts.

At the moment it's a prototype. I'm not a fashion person, so it's just a functional thing.

https://cad.onshape.com/documents/a4f9d866e261788fce5f44b8/w/f2dd6856f58cd7d5ee8a87e4/e/5e98ee294d3a61af4cc33e9e?renderMode=0&uiState=675db04348c839170e6b431b