One school principal has said those not offering girls the option to wear trousers are not conforming with the law.
It comes after a school in the UK banned skirts, and brought in a 'trousers only' rule for pupils.
Barbara Ennis is principal of Alexandra College in Dublin.
She told Lunchtime Live it is about choice.
"In our school we have a choice between trousers and skirts - the majority of the girls choose the skirts.
"I don't think they're an issue at all.
"And I think the idea of banning anything is really very retrograde - it reminds me of back in the bad old '50s, and even before that, when books were banned.
"Now we want to ban skirts - I'm actually wearing a skirt today, and I feel great in it".
She said schools should be offering the option of both.
"As far as I know if they don't offer the opportunity to girls to wear trousers, they're not conforming with the law.
"As far as I'm aware, girls have to be offered the opportunity to wear skirts or trousers.
"I don't think that extends to boys, I think boys have to wear trousers.
"So it's a kind of strange argument to be bringing out at this time of the year".
One listener, Jason, believes school uniforms should be banned altogether.
"I'm against uniforms for school.
"I think they promote a sort of a team mentality, which can positive in some circumstances but can be negative in others.
"So anybody who doesn't comply or look the same may stand out in a crowd a little more for people who are used to dressing the same.
"I think it promotes lack of understanding for the individual.
"I think teachers like it because it makes the school look good, I think they like it because it enforces a bit of control over the children.
"But I think if you actually gave the children the choice - 'Do you want to wear a tracksuit or a pair of jeans, or whatever you want, into school?' - they're going to go with that", he added.