It's a last part of the short story 'Pictures' by Katherine Mansfield. <1917>
It was almost dark in the café. Men, palms, red plush seats, white marble tables, waiters in aprons, Miss Moss walked through them all. Hardly had she sat down when a very stout gentleman wearing a very small hat that floated on the top of his head like a little yacht flopped into the chair opposite hers.
"Good evening!" said he.
Miss Moss said, in her cheerful way: "Good evening!"
"Fine evening," said the stout gentleman.
"Yes, very fine. Quite a treat, isn't it?" said she.
He crooked a sausage finger at the waiter–"Bring me a large whisky"–and turned to Miss Moss. "What's yours?"
"Well, I think I'll take a brandy if it's all the same."
Five minutes later the stout gentleman leaned across the table and blew a puff of cigar smoke full in her face.
"That's a tempting bit o' ribbon! " said he.
Miss Moss blushed until a pulse at the top of her head that she never had felt before pounded away.
"I always was one for pink," said she.
The stout gentleman considered her, drumming with her fingers on the table.
"I like 'em firm and well covered," said he.
Miss Moss, to her surprise, gave a loud snigger.
Five minutes later the stout gentleman heaved himself up. "Well, am I goin' your way, or are you comin' mine?" he asked.
"I'll come with you, if it's all the same," said Miss Moss. And she sailed after the little yacht out of the café.
My question is : what does "I like 'em firm and well covered," mean?
Many thanks in advance.