Great question — answering as the UphillTech team:
I don't think that you can damage a linen dress by hang drying. Linen fibers are very sturdy. Wool garments are another issue altogether, here drying flat is the way to go as wool can both absorb a lot of water and is not a fiber with a high tensile strength and is often knitted, wich is also not a sturdy structure in itself. Also, wool is suceptible to mechanical stresses and most wool washing programs don't spin at high rpms, leaving the garments still wet when coming out of the wash. By hang drying, the weight of the water, combined with the elasticity of knits and not sturdy fibers can easily lead to skewing, elongation and other unwanted issues. That is why knitted wool garments should...
Full answer by Sursula: https://lifehacks.stackexchange.com/a/28083 (CC BY-SA 4.0).
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