Lace leggings?? I think they're really pretty but haven't got a clue what you'd wear with them? Few ideas. Lace leggings is hot, wear with a black skirt and a big shirt or a dress, depends if you mean for going out or just during the day.
Even with just a plain but bright coloured dress and boots or things that have a peeptoe lace leggings look fabulous.
A few more tips on how to wear lace leggings in ways that are school appropriate. Hope this helps!
Abandon Frances Lace Leggings
Lace Print Leggings
Womens Heidi Full Length Lace Detail Leggings
Womens Tyra Full Length Lace Detail Leggings