In The Avengers (2012) Pepper Potts is barefoot in stark tower whilst Tony Stark wears shoes. This was done to mitigate the height difference between Gwyneth Paltrow and Robert Downey Jr. :
Iron Man - SLOTHCORE: COSPLAY AT LOW SPEED
1:6 High Heels W/Feet Pepper Potts Fit Suntan Removeable Leg Female 12" Figure | eBay