dike down, v. — Green’s Dictionary of Slang

dike down v.

also dike out, dike up, dyke down

[SE decked out + ? 13C SE dight, to put or place in order, to array, to arrange]

(US) to dress smartly; thus diked/dyked down, smartly dressed.

1901		Monroe & Northup ‘College Words and Phrases’ in DN II:iii 139: dike up, v. Dress up.
1902		C.L. Cullen More Ex-Tank Tales 11: It’s not necessary for any member of this club to [...] dike himself out in figurative red trousers.
1906		J.W. Carr ‘Words from Northwest Arkansas’ in DN III:ii 133: dike out, v. phr. To dress up. ‘She was all diked out for the party.’.
1983		R. Klein Jailhouse Jargon and Street Sl. [unpub. ms.].