The incident happened on Barton Street, Keelby, near the junction with Beach Holt Lane, on Tuesday.
George says he was frustrated he could not wear shorts at Caistor Yarborough Academy during hot weather.
A lorry driver was heading to work on the A18 near Grimsby when he spotted the "quivering wreck".
People are being urged to donate old bras to raise money for the charity Against Breast Cancer.
