If you are wearing the Slinky Black Omnisuit when equipping clothes from Sera for the Disco 3000 quest (this occurred when I was changing into the School Girl outfit), the extra textbox caused by removing the Omnisuit (as opposed to no extra textbox when removing other clothes) seems to break the quest; you still change into the outfit Sera gives you, but the quest is halted. You never go to the party and the option to go is removed from Sera's Talk menu.
Save file for proof is attached.
Save file for proof is attached.