Most of the time no. But if I go into the “clean room”, which is dust-free, to work, then I have to put on the clean room outfit, which does include a hair covering. It’s a bit like a shower cap. Also, shoe covers, which look particularly silly.
In the office no.
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But when we are in the cleanrooms we have to yes: https://www.sstl.co.uk/getmedia/fca88a95-f77b-4f88-b783-9f1aa546f3cc/SSTL-2017-2962.JPG?width=2000
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When we are in the optical cleanrooms we need to wear something that covers more than just our hair, the suits look like this (not a picture of the SSTL optical cleanroom):
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When we are fuelling the spacecraft with it’s Hydrazine fuel we practically need to wear spacesuits (credit to NASA for this one):
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