The most common and most likely answer to this crossword clue is the 7 letter word TOPLESS
I've seen this crossword clue in The Daily Telegraph
T
O
P
L
E
S
S
More clues leading to the result TOPLESS
- Unimaginably high and not fully dressed
- Partly undressed, losing one's head?
- Sets off to bring in work left uncovered
- xposed?
- In this way, prose would be got up, daringly exposed
- Hardy girl acquires old place, revealing chest
- are-chested?
- Slept so badly in a state of deshabille
- Backing group into rock’n’roll is Busted, apparently
- Feverish, so slept with pyjama bottoms only?
Buddy explains!

The straight part
We know that "pyjama bottoms only?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case pyjama bottoms only? = topless.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 TOPLESS mean?
TOPLESS noun- A convertible car having the top retracted or otherwise open.
- Lacking a top.
- Very high, towering.
- (chiefly of a woman) Not wearing a garment covering the top half of the body; naked from the waist up.
- (of a place) Featuring women that are naked from the waist up, often strippers or dancers.
- Not wearing any clothes on the upper body.