The battle was in January 1815 and conditions were rather cold and wet and not as one thinks of hot/humid New OrleansTanker123 said:It was said the British marched a good distance wearing the thick red coats to fight at the battle of New Orleans in the War of 1812. Water was scarce and many were dehydrated. The British army was not in premium shape to attack well defended Americans.Sapper Redux said:ja86 said:
the British wore red coats to hide the blood is a myth, they wore red starting in Cromwell's army because red wool was cheap and available, the tradition lasted until after the boer war
Technically British infantry started wearing read in Ireland under the Tutors. It became universal under the New Model Army. Red was also easier to see amongst the smoke. Exceptionally important for officers during 18th century linear warfare.
https://www.nola.com/news/cold-adds-historic-touch-to-battle-of-new-orleans-commemoration/article_e52c8d1f-e994-588c-9edf-ef31b112c099.html