Green’s Dictionary of Slang

(US) dressed up; thus bug up v., to dress up.

1893		O. Wister ‘Texas Vocab.’ in Wister Owen Wister Out West (1958) 159: Bugged up dressed up.
1897		O. Wister Lin McLean 3: ‘Bugged up to kill!’ exclaimed one, perceiving Lin’s careful dress.
1930		G. Milburn ‘The Dealer Gets It All’ in Hobo’s Hornbook 149: I’ve bugged-up, bo, and mush-faked – done time in old L.A.