You should be fine if you line them. Use a heavier blackout lining.
I made just such a pair of curtains this weekend for DGD. Although the fabric I bought was described as curtain fabric, it was more like dress fabric, it was so light, but with a blackout lining, it both excludes light and the weight of the lining makes sure that the curtains hang well.
Do you get emotionally attached to the plants in your garden ?
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Only 50% of middle age adult manage more than 1 brisk 10 min walk a month.


