Not allowed entry, the BJP MLA from Lauria in West Champaran district sat on dharna in the lawns outside the assembly.
Bihari had come in the attire to protest against the state government for not constructing the 44.325 km road from Bettiah to Manuappa via Yogapatti Ratwal despite Chief Minister Nitish Kumar's announcement on it at a public meeting in 2013.
Leader of Opposition Prem Kumar raised the issue in the Assembly and pleaded Speaker Vijay Kumar Chaudhary to allow Bihari come inside the house.
He quoted rule 29 (1) of Assembly which prohibits "ashisht acharan" (not following etiquettes) inside the House and said the present case fell in that category.
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Senior BJP leader Sushil Kumar Modi, Leader of Opposition in Assembly Prem Kumar and a host of party legislators joined the agitating MLA.
Later, talking to reporters, Kumar attacked the chief minister and held him responsible for the MLA vowing to wear shorts and vest till the road was constructed.