Excuse me while I go look up what a tunicle is!
I am the cantor fire Good Friday since we don't use the organ and thought the visual of the C&S with a red cope would really open the congregation's eyes.
Liturgy is not theatre, and vestments are not costumes.
bk-XXVII
Red copes are not reserved for cardinals - don't get these confused with the red capes worn by cardinals as part of their habito piano ('street dress' i.e. cassock, fascia, etc.) when the cappa magna is not worn.
Choir dress does not change color with the season. If you are vested in choir, the traditional color is black. As discussed in another thread (probably the one about organists vesting) some specific places vest in another color for some site-specific reason (a dedication to the BVM, a cathedral, etc), but those are generally special cases.
The reason not to vest as an organist/cantor/director unless the whole choir is vesting has nothing to do with rules and everything to do with not making vestments about you, the wearer.
There are those who object to women wearing cassocks as it is traditionally considered clerical attire.
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