Yes, you can deduct out of pocket expenses as a volunteer, as a charitable deduction. Uniforms, dues and equipment would be included.
For conventions, see page 5 of this link:
"If a qualified organization selects
you to attend a convention as its representative,
you can deduct your unreimbursed expenses
for travel, including reasonable
amounts for meals and lodging, while away
from home overnight for the convention. You can't deduct personal expenses for
sightseeing, fishing parties, theater tickets, or
nightclubs. You also can't deduct travel, meals
and lodging, and other expenses for your
spouse or children.
You can't deduct your travel expenses in attending
a church convention if you go only as a
member of your church rather than as a chosen
representative."
Also see Travel, also on page 5.
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