Lightweight Knit Cape,
worked with 6 mm circular needles (US 10)
Top down, all in one piece.

Lightweight for spring or summer.
For a chunky style see this listing:
https://www.ravelry.com/patterns/library/738-cape

Close with a shawl pin, or pass
a ribbon or cord through the neckband.

I used Red Heart Super Saver,
(Red Heart Comfort yarn is the same but in a larger ball.)
You could also use Bernat Premium.