Rule number one can go straight to hell

5 Ways to Lose Your Sanity While Working from Home

They're both wrong. The key is to have a heirarchy of sweatpants--ie you must change from old ratty yoga pants into new(er), more stylish yoga pants.

Note: I am breaking my own rule today--still in the 8-year-old hand-me-down sweatpants from last night. Rainy day exception.