The following text is an excerpt from "Wifey Redux" by Kevin Barry:
I sighed and left the den. The way it worked, Ellie had the use of the sitting room down back of the ground floor; no teenager wants to sit with her parents. She’d had a decorator in – it was got up in like a purple-and-black scheme – and she had a really fabulous Eames couch we’d got at auction for her sixteenth, and I went down there to check on Aodhan and herself.
How to understand the word "decorator" and "got up in"? According to the word "like", I presume there is some resemblance between the decorator and the scheme, but fail to see the connection.