The most common and most likely answer to this crossword clue is the 8 letter word PINAFORE
I've seen this crossword clue in The Guardian
P
I
N
A
F
O
R
E
More clues leading to the result PINAFORE
- Garment fastener comes with a warning
- 11 turned in engineer of an iPad
- . Long to accept piece of advice in place of PPE?
- One in favour of donning long protective wear
- Ship first to feature in opera composition
- Stick a warning in item of clothing
- Head of army in favour of donning long dress
- Protective garment used by chap in a forest
- Apron-like garment found in shop in a forecourt
- Dress has fixture at the front
Buddy explains!

The straight part
We know that "dress" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case dress = pinafore.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 PINAFORE mean?
PINAFORE noun- A sleeveless dress, often similar to an apron, generally worn over other clothes. Most often worn by young girls as an overdress.