Conceptually there is no need for an "or." Hearing children do not
literally mean it as a choice. They are making a statement that gets them
candy. If they literally meant give me candy or I'll tip over your outhouse
then I could see a need for the "or" concept. If the "or" concept is
used at all in this "statement" it would be a very, very small body shift.
COSTUME is signed in context using the sign CLOTHES. You establish the
idea that you are talking about Halloween. Then you ask someone what
clothes they'll be wearing. It is understood that you are talking
about a "costume."
If you need to make it clear, you can sign "HALLOWEEN CLOTHES" and
eliminate the second movement of Halloween. Since it is a compound sign.
Matches: This is a noun-verb pair with "light-a-match." Use a
small double movement to mean "matches." Note: Context can also be
used to change the meaning of "light-a-match." to match. For example,
suppose I signed, YOU HAVE "LIGHT A MATCH?" That would mean, "Do you have a
match?" (Which means, "Do you have matches?")
The sign "LIGHTER"-(flame) is done by holding an imaginary lighter in
your hand and clicking the switch twice.
- Dr. Bill