A snap-flap means that this anorak is fashionable and functional.

Source: https://www.courant.com/2023/11/09/8-best-anorak-jackets-for-fall/

He was last seen wearing a black anorak with a yellow/green zip with grey joggers and black slip-on shoes.

Source: https://www.harrogateadvertiser.co.uk/news/crime/north-yorkshire-police-launch-urgent-appeal-to-locate-missing-man-from-harrogate-4249544

Long white hair, pale grey anorak, reading the newspaper.

Source: https://www.theguardian.com/books/2023/aug/20/mother-planned-own-death-natasha-walter-before-the-light-fades-suicide

Some might even say boring, I know my kids refer to me as an 'anorak', but they are parts of the area we pass and walk by but they just disappear into our subconscious and become part of our every day.

Source: https://www.birminghammail.co.uk/news/midlands-news/gallery/secret-bits-birmingham-beyond-miss-27384806

The woman was wearing a royal blue anorak, black V-neck T-shirt, black trousers, white trainers and glasses with black rims on the top and was carrying three shopping bags.

Source: https://www.bournemouthecho.co.uk/news/23933455.jewellery-stolen-high-street-shop/?ref=rss