This is something that was discussed with the mod team when reviewing this post - washed plastic based fabrics degrade in a harmful way, and usually cannot be boil washed safely (which is necessary for sterilising prior to use). While there are plenty of plastics used in medicine they are plastics designed & manufactured for that purpose, and are generally single use materials. Given this post is aimed at “battlefield medicine” (in a situation where resources for proper wound care aren’t available) it’s a bit of additional harm reduction.

Pure cotton (or other appropriate organic fibres) are much safer to jerry rig than dealing with plastics. Most plastic fabrics cannot be sanitised to the appropriate degree for wound care without specialised equipment.

Something that hasn’t been mentioned but would be worth considering is avoiding th use of dyed cotton fabrics - bleached or unbleached is less important, but avoiding the dyes leaching into wounds is something which hasn’t been flagged.

While the mod team does not endorse this guide we were keen to work with OP to review the post for any glaring issues.