Which fabrics will keep me most comfortable when dressing?

No specific answer: I am not aware of any concensus on the best fabric for all situations. Much would depend on personal preference and enviorment is also important. In warm climates linen and cotton are often favored. However, in colder areas wool is a popular choice. Many people like the feeling of silk against their skin. The decision is a personal one based mostly on experience.

Natural fibers: Like cotton and linen may work.