If beauty is in the eye of the beholder, perhaps also is proper attire for liturgical dance. To apply the Justice Potter Stewart for pornography, "I know it when I see it," people know improper attire when they see it.
This naturally makes it difficult when planning such events since the test for what is proper is subjective. One needs to have a good sense of the intended assembly, and still some may be offended. In Bible class this morning we began to work our way through Romans 14 and the giving and taking of offense. Keeping that in mind, as planners need to keep in mind the sensibilities of those assembled, those assembled need to keep in mind the needs of those who do the dance (for reference review what Pr. Wolf posted), and not be too quick to judge.