travelgirl and Boise Ed and Mdbrownmd all sent this in.
“I suppose that Wayno is contrasting the formalwear with the casual floral shirts that TJ people wear at work. That’s the closest I can come to discerning a joke here.”
“Am i dense for an inability to understand the caption as it relates to the visual? the couple appear to be married, formally-dressed, watching TV while eating food “well-dressed” people probably aren’t going to order often, at least not while wearing gowns and tuxedos…
And why Trader Joe’s? please help enlighten someone who just woke up a few minutes ago :) “
“I just don’t get it, and I shop at Trader Joe’s all the time.”
Comics I Don't Understand 
I like the elegance, and the irony, both!
I don’t shop at Trader Joe’s, but I took it to mean that people who work there (1) dress very casually and (2) are supportive of high-quality, healthy food choices. So when they are at home, for relaxation, they do the opposite of these things.
And the “pizza” box clearly has a picture of a cherry pie, ho ho. I guess because that would be bizarre?
Yes, Y. Knott, the fruit pie (usually blueberry) is a Bizarro thing. It’s one of the “Secret Symbols”, as explained at https://www.bizarro.com/secret-symbols
Or Trader Joe’s employees are, in someone’s opinion, grossly overpaid but they know how to live it.
Trader Joe “uniforms” are Hawaiian shirts (employees wear their own). So yes, the employees are very colorful and casual at work.
They’ve changed out of their work duds and are just chillin at home.