how about Turtle neck? This is something like "cuello polera" in Spanish.

don't think we use chimney! But a cowl goes on top of a chimney (cover to keep the birds out)

If you make a search for chimney neck (unquoted) you get many hits (see below). But if you quote "chimeny neck" you will not get one single hit.
Your search: chimney neckline Categories | Web Sites | Web Pages | News | Research Documents

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Welcome to Neva Imports - Russian Dolls - Museum Quality ...
... Feodora realized that she was falling in love with this chimney sweep. ... Sleeves,
neckline and entire hemline bordered in magnificent mink. ...
http://www.nevadolls.com/single_product.cfm?prodid=NEV117


No. 5: Dramatic Spring
... Wide bands of patterned trim around neckline, hem, and lower edge of sleeves. ... about
this one is how it stays perfectly clean even after he goes down the chimney ...
http://eroicafans.org/Wardrobe/vol5.html


august1997
... turtlenecks. You want to help the vapor to get out of the garment,
and an open neckline will act like a chimney. Your movements ...
http://www.wiggys.com/html/august1997.htm


Wingspan
... He stopped at the neckline of my gown. ... A rough wind rattled the windows in
their frames and a gust whistled down the chimney, cold and fresh. ...
http://www.gleeful.com/Wingspan/rimi3.html


Humor and stories for interpreters: War stories
... We'd be intepreting and she'd pull up the neckline of her blouse blow her nose ... and
I 'forced' myself to still stare at the nose-picker while doing his 'chimney ...
http://www.theinterpretersfriend.com/misc/humr/war.html