The most common and most likely answer to this crossword clue is the 3 letter word RIG
I've seen this crossword clue in The Daily Telegraph
R
I
G
More clues leading to the result RIG
- Playwright's doctor
- Some original equipment
- There's nothing odd in trying outfit
- Having no end of pain, call doctor
- Apparatus is correct after eliminating high tension
- Part of brigadier’s equipment
- Key taken from prison doctor
- Large American lorry stuck in Brighton
- Doctor‘s trying, but oddly deficient
- Complete clothing for touring around, but not the North
Buddy explains!

The straight part
We know that "Complete clothing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case complete clothing = rig.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 RIG mean?
RIG noun- The rigging of a sailing ship or other such craft.
- Special equipment or gear used for a particular purpose.
- A large truck such as a semi-tractor.
- The special apparatus used for drilling wells.
- A costume or an outfit.
- A computer case, often modified for looks.
- An imperfectly castrated horse, sheep etc.
- Radio equipment, especially a citizen's band transceiver.
- A model outfitted with parameterized controls for animation.
- To fit out with a harness or other equipment.
- To equip and fit (a ship) with sails, shrouds, and yards.
- To dress or clothe in some costume.
- To make or construct something in haste or in a makeshift manner.
- To manipulate something dishonestly for personal gain or discriminatory purposes.
- To make free with; hence, to steal; to pilfer.
- To outfit a model with controls for animation.
- A ridge.
- A wanton; one given to unbecoming conduct.
- A promiscuous woman.
- A sportive or unbecoming trick; a frolic.
- A blast of wind.
- To play the wanton; to act in an unbecoming manner; to play tricks.
- An algebraic structure similar to a ring, but without the requirement that every element have an additive inverse.