That's a long-sleeved sweater, thigh-high socks, and short shorts, just in case you want to make a "what not to wear on your next JetBlue flight" checklist. McMuffin offered to tie that sweater around her waist, or cover the shorts with a blanket, but this wouldn't fly with JetBlue, and she had to buy a $22 pair of pajama pants from the airport in order to board her flight home.
When questioned about the incident, JetBlue provided this statement to KIRO 7:
“The gate and on board crew discussed the customer’s clothing and determined that the burlesque shorts may offend other families on the flight. While the customer was not denied boarding, the crew members politely asked if she could change. The customer agreed and continued on the flight without interruption."