In Nisaba's terms, I think of being "in the closet" as someone's covering it up, whether by omission or downright dishonesty about what they're doing. If you have to keep your tarot reading, homosexuality, stamp collecting, or whatever under wraps, due to your peers, your living situation, or personal reasons, then you are, the way I see it, officially "in the closet". And, there's nothing wrong with that, for the record.
If the subject is breached, and you are able to answer with confidence and honesty, then you're out. No matter if every single person you come in contact with knows about it, or just a few people, if you're honest with folks that care to dig deeper, then you're out. Not all of us need to throw a party, and announce that we're tarot readers, or wear our spiritual or sexual alignments on our sleeve.
In my case, happened over a long span of years, very slowly and organically. Tarot is as naturally part of me as my green eyes, there for everyone to see, but still not everyone does. I could no more lie about my eye color, than my spirituality, and Tarot is a big part of that.. Many people in my life still do not know, or bother to dig deeper, and find out.