You worry too much about matching clothes. Remember, people can make a pack for any character, thus there could be any clothes, even futuristic ones. Also when you make a pack, you cannot know for sure what kind of images the character will have, thus many types of clothes are acceptable for a tag.
Of course we should avoid futuristic stuff when possible, but other than that, there is no a certain, detailed and strict pattern.
1-2. Strippers and prostitutes don't have a certain uniform. They could use revealing clothes more freely, yeah, but they don't have a special, working clothes. When we show them at work, it means any pics with sex. Examples of revealing clothes from my last pack:
one,
two.
3. Formal are usually dress that is too fancy to wear it every day. More examples:
one,
two.
4. Barmaid pictures are so rare that in all my packs there are like 2 pictures that could be considered as barmaids. We used to have this tag, but eventually gave up and removed it. So even if you render barmaid pictures in your packs, pretty much all other packs won't have them anyway. And of course it also means that we don't have a decent examples to render it in the first place, so just give up on it.
5. Clothes that are normal = not formal, not revealing. In some cases they even could be unique, like maid or miko, if the character wears them 99% of the time.
You pretty much can take any clothes, from neptunia or deviantart for example, and call them normal for one single character pack. I'll say it again, we don't have a strict example that you must follow. In existing random packs many characters simply use schoolgirl uniform as normal one. Or similar clothes like
this.
Another example, and
one more. As you can see, we take any casual clothes as normal ones, trying to avoid futuristic ones if possible.
6. Gambling tags are
based on suitable background, ie casino with any clothes. When we don't have it, we begin to use bunny pictures. Another way is to add cards or casino chips to the picture.
7. Waitress is an action. It's not based on clothes, it means a girl (not nude or close to it) that works as a waitress. In many cases she also has maid dress, but not always, far from that in fact.
Example in normal clothes.8. No strict concept, but there is a difference between nurse and healing, I want to tell it just in case. Healing is something like
this, ie she is not stripping or having sex or sleeping, etc.
9. Your maid clothes are perfect, there is no a "Pytfall concept". I can, however, give an
example of night club waitress, basically revealing maid clothes.