Choose appropriate rope
Some people are allergic to long grasses. Some have high degrees of skin sensitivity. Some have texture preferences. Talk about this and choose appropriate rope.
If someone is allergic to long grass, don’t tie them with hemp or jute…
Rope - Hemp 6mm - 30 & 15 | Classic look, feel & smell, rougher, more fiberous
…Go with cotton or a synthetic.
If someone is severely allergic, only use synthetics that have not even been stored in the same bag as natural fibers!
Rope - Nylon & MFP
Rope - Nylon & MFP | Smoother, often softer, few free fibers, stronger
If they are sensitive to texture (perhaps because of Fibromyalgia, Autism Spectrum Disorder or other condition)…
…choose a smoother rope with fewer stray fibers.
Let them test it against their skin and decide if it will work for them.
Another thing that can help in the case of sensitive skin is tight fitting garments. Tight enough to keep the skin supported and firm enough to protect the skin from the rope and not snag the rigger's finger's while tying.