Waterproof coat (6)
(Other definitions for anorak that I've seen before include "Boring type's coat" , "Zipped jacket with hood attached" , "Jacket; nerd (colloq.)" , "Garment (worn by boring obsessive?)" , "Raincoat" .)
(Other definitions for mackintosh that I've seen before include "Architect" , "waterproof layer" , "Raincoat" , "Garment" , "providing protection from the elements" .)
(Other definitions for macintosh that I've seen before include "Raincoat" , "Protective cover" , "Waterproof" , "Scottish inventor" , "PC" .)