The headword is the dative singular -- determined by e)/oiken -- of the noun doqih/n (LSJ at web address 1).
cf. delta 1321; Hesychius alpha3429, delta2139, omicron639.
The quotation stems from Aristophanes, Wasps 1171-72 (web address 2) and represents the answer of Bdelycleon to his father Philocleon, who has just asked "Look at my gait, and see which rich man I resemble the most in my way of walking!". One would expect some proper name, but Bdelycleon unexpectedly answers: "Whom? a boil dressed with garlic!”. The scholion Ravennas ad loc. only remarks that Bdelycleon a)proslo/gws pai/zei, "is fooling beside the point". The scholia recentiora refer the joke to the expression diasalakwni/sai of line 1169, then give an alternative interpretation of the whole comparison: "[Bdelycleon speaks in this way] to his father, for he is wearing the cloak in an ugly and slouching way, just as the garlic is not proper for the therapy of a boil". However, it is known that among the ointments used in antiquity to heal abscesses, boils and other inflammations, garlic poultices were commonly used: cf. Pliny the Elder, Natural History 20.54-55; Aristophanes, Ecclesiazusae 404ff. Thus the meaning is probably that Philocleon’s get-up is similar to the walk of someone who is hobbling with a sore foot, or that he is completely enveloped in his cloak as a boil in its poultice.
The original text reads indeed sko/rodon instead of the skoro/dw| here: an accusative of relation, commonly occurring with the participle h)mfiesme/nos in the sense of "dressed/clothed in something"; see Aristophanes, Thesmophoriazusae 92, Ecclesiazusae 879 , etc. (LSJ at web address 1). An easy assimilation of the ending determined by the frequency of datives in the sentence has brought about the Suda’s variant.