Why does lomov go to tschubukovs home dressed in formal clothing?

Lomov goes to Chubukov's home dressed in formal clothing because he intends to propose marriage to Chubukov's daughter, Natalya. His formal attire reflects the seriousness of his intentions and the social customs of the time regarding marriage proposals. Additionally, Lomov's nervousness and desire to make a good impression are heightened by the importance of the occasion.