Lacy underwear is a quest item obtainable only in Tranquility Lane in Fallout 3. It belongs to Martha Simpson.
Location
It can be found in the Simpson residence on her bed. It can be used during "Break up the Rockwells" in Tranquility Lane. Place it on Rockwell's workbench in their basement and tell Mrs. Rockwell that there is something she should see. She will follow you to the basement, and you can convince her that Mr. Rockwell is either cheating on her or a cross-dresser.
Related quest
Notes
- When the lacy underwear is viewed in the Pip-Boy (by pickpocketing a Chinese soldier), where the item's picture should be it says "PipOS Error -26 [File Not Found]"
- Though it no longer serves any purpose, this item is still found in the game files for Fallout: New Vegas.