Ryoko: the super neon series is supposed to be really bright and opaque, so it should be good for your costume. It can be found here:http://www.pinkyparadise.com/webshap...roductItem=412
The lenses you're looking at will probably be bigger then 14mm because you're look at circle lenses, which are cosmetic lenses from korea that are meant to make people's eyes look bigger by covering osme of the whites of the eyes. Also, the nudy series is really bad for cosplay, even more so when you want a dramatic color change. They have some clear spots in them that allow your natural color to show through.
As for brown lenses, You should try something like these: http://www.pinkyparadise.com/webshap...roductItem=400
because they're pretty darn opaque and natural looking.
For more optinos on the pink lenses, try looking here: http://www.kiwiberry1-collection.com...lenses/page/1/