Hi all
Ask your engineers how many of them are missing digits or bits of hands from having snagged a ringwearing finger on a bit of machinery. There's always at least one. That's also why we don't wear ties (if you must, wear a clip-on), dangling jewellery and do our best to keep our clothing and headgear restrained. Apart from that, we wear cotton gloves because of the hazardous nature of turbine oil, hydraulic fluid and Avtur. Dermatitis is one thing they don't mention in flight school.
regards
TDD