Comfort is relative, we're not talking about silk undies. All belts mentioned will protect you well in a short encounter, but you will probably be constantly aware of their presence on your hips and between your legs. Have you told us all about your motivation Laura? Do you regard your belt as an anti-rape device only? because every steel belt out there, even the cheap chinese ones will deter an attacker who is trying to touch you below the shield - it makes me sad we have to even think about and prepare you for such kind of situation.
Or is there more the belt should do for you? Tickle your aesthetic fancy, help you concentrate on your studies, provide hard evidence for a challenge taken, make sure to keep you chaste in selected situations?