The phrase "a single outfit" is correct and usable in written English.
It can be used when referring to one complete set of clothing worn together.
Example: "She decided to wear a single outfit for the entire day to keep things simple."
Alternatives: "one ensemble" or "a complete look".
Without wearing a single outfit that could be considered truly rule-breaking, Obama has rewritten the playbook.
Yet never did a single outfit in the collection look like Edwardian costume or a reintroduction of the bustle.
On the runway, clothes that morphed from cropped top to draped middle to woven skirt — within a single outfit — was a more difficult equation.
Or about the fusing in a single outfit of contrasting fabrics like fluffy wool and weightless polyester (and maybe other mysterious materials).
They were many and various, often in a single outfit, as drapes crisscrossed the bodice under translucent tops and dresses clung fore and aft.
Mr. Wolfe, the fashion forecaster, switched to a single outfit last summer as a protest against how accessible trends had become.
This exhaustive 19-CD box set, featuring every Clash single in its original sleeve (there's also a more compact 4-CD set), is an awesome reminder that, amid the fuss over their albums and political posturing, their brilliance as a singles outfit has been overlooked.
"She is a fashion disaster, she wears a denim jacket over every single outfit – sari, salwar kameez, everything," a nameless student noted of one teacher.
Sometimes the effect was melded into a single striking outfit, but too often the effect was of busy energy that needed to settle down.
But the pattern mishmash, pitting the elegant graphic prints against each other in a single summer outfit of jacket, shirt and shorts, looked too much like a follow-up to the wave of prints that engulfed wardrobes last summer rather than a Hermès-specific elegance for 2013.
Haider Ackermann started his exceptional show with silence — then music built up as slowly and delicately as the show's color palette changed from black to rich turquoise, teal and plum, and maybe all of that in a single satin outfit.
