The Museum of Fine Arts told guests to attend the “Hippie Chic” opening party in costume, and boy did they follow directions. Employees, donors, and volunteers crowded the MFA in wigs, beads, leather headbands, flowing dresses, and some original ’60s designs that they made themselves during the “free love” era. Revelers at the affair included WHDH’s Janet Wu, MFA textile and fashion arts curator Lauren Whitley, wig artist Jason Allen, donor Stephen Borkowski, Historic Deerfield curator Ned Lazaro, and MFA conservator Susanne Gänsicke, who told us she worked on the chastity belt in the exhibition. The crowd was greeted by painted vintage VW buses, which will be back in front of the museum from 4 to 8 p.m. Wednesday, when the MFA offers free admission. “Hippie Chic” runs through Nov. 11.