I've seen different sets of people from around the country mention a "custom party" on written Halloween invitations. Does it simply mean costume (and just intentionally mis-spelled)? Or some specific kind of costume?
closed as too localized by J.R., Mark Beadles, FumbleFingers, JSBձոգչ, tchrist Oct 28 '12 at 1:54
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As you will have gathered from comments- the writer of the invitation cannot spell, and means 'costume party'
You can use custom to mean bespoke, but you would need context for it to mean anything here.