Aluminized cotton to insulate window curtains?

[BigPapaV]

Hey guys, has anyone tried putting aluminized cotton (or similar) fabric on the exterior side of a cotton curtain/cover as a radiant insulation barrier?

https://burlapfabric.com/other-fabrics/heat-resist...e-per-yard

https://www.hipstitchabq.com/shop/c/p/Cotton-Fabric-with-Heat-Reflective-Coating-x59111597.htm

It sounds like ironing board material is made of this stuff, and sounded like a more cozy option than Reflectix bubble wrap. Also I'm thinking the bubble wrap type insulation covers fold up rather bulky when not in use.

I have snaps on my windows and the wife-made cotton covers get rolled up / strapped out of the way when not in use.
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1986 VW 3-knob Syncro Tintop w/ 1992? Suby Legacy 2.2L (KEP install)

[campism]

We used the ironing board fabric, which also helped darken the interior when the curtains were drawn.

Here's a pic of it in place. Does not photograph well.

A better one, done during a trans fluid change.

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'87 Westy in Wolfram Grey Metallic, tragically crushed by a falling hickory tree in my own driveway and now gone, leaving me Vanagonless and with no plans to replace it, alas.