The most common and most likely answer to this crossword clue is the 9 letter word GABARDINE
I've seen this crossword clue in The Guardian
G
A
B
A
R
D
I
N
E
More clues leading to the result GABARDINE
- German poet wearing excellent new English coat
- Nag a bride dancing in a raincoat
- Writer visiting Georgia linked with fashionable European material
- Badger in a woolly coat
- Realise English includes Shakespeare material
- Talk about Arden taking interest in material
- Bargained to tailor the material
- Arden gets a big fancy material
- Tailor bargained for twill fabric
- Bargained about coat
Buddy explains!

The straight part
We know that "a raincoat" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a raincoat = gabardine.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does GABARDINE mean?
GABARDINE noun- A type of woolen cloth with a diagonal ribbed texture on one side.
- A similar fabric, made from cotton.
- A gaberdine (garment).
- A yellow robe that Jews in England were compelled to wear in the year 1189 as a mark of distinction.