Having spent time as a steel erector/welder I can vouch for the benifits of wearing natural fibres next to the skin.
If you do buy overalls or flight suits in cotton go for Sanforised or Proban-treated ones they cost a bit more but stay fire proof longer. All materials become more prone to catching light with age as the material wears especially if you have frayed edges, as one of my apprentices found out. So save the frayed jeans for going uptown topranking!
Leather flying jackets are fine if they are sheepskin but beware many replicas have acrylic fleece which flares and melts
Bomber jackets also often have synthetic linings which again melt and stick to your skin. So don't scrimp pay that bit extra for the silk lining.
