"dressed accordingly" is correct and can be used in written English.
It typically means that someone is wearing clothes that are appropriate for a particular situation or event. For example, "The bride and groom's wedding guests were dressed accordingly in formal attire."
At the interview, you have to decide whether to be a goddess or a superhero, and you are dressed accordingly.
Mr. Walkowicz, who dreaded spending New Year's with a stranger -- even a model -- called it "a mercy mission" and dressed accordingly.
The Beacon is itself something of a velvet-trimmed playhouse, and the band — Steve Nieve, on piano, Pete Thomas, on drums, and Davey Faragher, on bass — was dressed accordingly.
He's dressed accordingly colourfully, in a Ramones T-shirt with a rainbow coloured scarf over his head – punk rock meets The Magic Roundabout – and after a flurry of exclamations ("Hi! Hey! I love your shoes! I love your dress!") he winds his skinny body on to a chair and starts to fidget.
The performers were dressed accordingly, in Depression-era chic with contemporary accents: Persephone (Amber Gray) wore a chartreuse dress and held a market bag full of flowers; the Fates (Lulu Fall, Jessie Shelton, Shaina Taub) evoked Gunne Sax meets Siouxsie Sioux.
The Southern Poverty Law Center has described Spencer as "a suit-and-tie version of the white supremacists of old, a kind of professional racist in khakis", and on Saturday he was dressed accordingly, in a fitted grey suit and brown loafers, and sporting an undercut hairstyle.
Guests are expected to dress accordingly.
— Girls over the age of ten are considered adult women, and must dress accordingly.
When they ask me to do it, too, I'll dress accordingly.
Climate control is a matter of checking the weather forecast and dressing accordingly.
He expects his wife Banafsheh to dress accordingly in the pious, working class south Tehran neighborhood where we ate.
