flatbush27, You declared, “I dont think its tznius at all for women to dress up or wear costumes on Purim.” To me that means a ban.
In the last several years we have seen a lot of Gedarim (fences) in the area of tznius go up. Allowing any drunkedness leaves a huge gap in the fence.
When you have huge gaps in the fence adding a few more feet to the height of the fence is meaningless.