This is a great thing that you are doing. Don't worry about the head coverings. Prior to Vatican II, women were expected to have their hair covered and many wore hats. If the student women want to wear a hat that is fine. Sometimes extra veils are provided in the back of church for those who want to wear them. I don't think anyone will get on anyone's case for lack of a head covering.
Since people can get confused the first time they ever assist at a Traditional Mass, perhaps you can also tell them not to worry about keeping up with the priest. If they just want to look and meditate on what is happening, that is just fine. If they get "hooked", there is plenty of time to study how to participate.
I would also recommend that, if possible, you arrange for a priest or someone from the parish to meet with the students afterwards to answer questions and encourage them to return. My husband is a convert from Protestantism and he was lost the first time we went to the Traditional Mass. However, he said to me, "We have to come back." So the Holy Spirit will work in each person. Perhaps you might encourage each student to pray to the Holy Spirit to open their hearts to this liturgy, and make understanding easier.
I don't know if the parish has people who welcome people when they are new, but it would be really beneficial if the students were invited to return by a regular member of the parish. Perhaps someone from the parish who is also a student might take your student friends in hand. Just some thoughts. I love this liturgy and have to drive 3 hours one way to attend when I can.