The most common and most likely answer to this crossword clue is the 7 letter word ONESIES
O
N
E
S
I
E
S
Buddy explains!
The straight part
We know that "Stand-alone siesta’s clothing?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case stand-alone siesta’s clothing? = onesies.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 ONESIES mean?
ONESIES noun- Name given to a number of one-piece attires
- A call in any childrens game, such as jacks, where one action must be performed.