We see that Paul is not creating a law for the Church here; he is very specific about this. He claims not on Holy Authority for these pronouncements, but founds his argument on the ‘nature of things’. And the nature of cultural concepts are not stable, they change between cultures. It is not always, in every society, dishonourable for a woman to have short hair. Therefore Paul asks his readers to judge for themselves. He only asks that if it is dishonourable, then do not do it in Church.
Evangelical Christians who hold to the exclusionist position found their argument on Paul’s teachings. This position, which has become known as ‘headship’, relies on his writing. But we must keep in mind that Paul is writing for a specific reason, he is writing a pastoral letter for a specific church, not a law book for the Universal Church. To fully understand Paul’s message in order to faithfully apply it to ourselves we must try to uncover his reasoning, not just his pronouncements.