I don't know about uncut hair or veils from
1 Corinthians 11 but it is clear that long hair on a woman is a good thing and that short hair on a man is a good thing.
14 Doth not even nature itself teach you, that,
if a man have long hair, it is a shame unto him?
15 But
if a woman have long hair, it is a glory to her: for her hair is given her for a covering.
Hair is not a sin issue. It's a shame vs. glory issue.