OK, I get the shamrocks and the rainbows, but cats, bunnies and elephants? Is that a slingshot? I must be too old for the reference(s)…
I think they’re supposed to be wishbones. I see lucky pennies, fortune cookies, and the rabbits (with feet) might be Rabbit Rabbit Rabbit, which I only know because a crazy aunt posts on Facebook every single month.
I thought the bunny was for the rabbit’s foot but it looks like there is a rabbit’s foot on the shirt. The cat with a raised paw is the Fortune Cat that is popular in Chinese and Japanese cultures. The elephant is considered good luck and used frequently in Feng Shui. I also see a ladybug, a shooting star and I think that slingshot thing is supposed to be a wishbone.
So is this supposed to be St. Patrick’s Day themed, or just about being infallibly lucky?
Probably both. Or possibly, about the luck o’ the Wootish. 
Oh, that’s why my life has been a hellish nightmare. You’d think people would share this information more freely. Rabbit! Rabbit! Rabbit!
Waving Cat (Japanese) - Maneki-neko - Wikipedia
Ladybug (Ladybird) - Ladybug Symbolism - Lucky Ladybird Meaning and Superstitions
Elephant - Elephants for Good Luck - Elephant Symbolism - Superstition
I have no idea what the eggplant - or weirdly shaped acorn is supposed to be.
An once again, can we review that this shirt is a four leaf clover, not a shamrock?
Four leaf clover being a symbol of luck, of course, which is why the design has all those lucky symbols inside.
But it is not a St Patrick’s Day symbol.
I know it was asked in the comments - but nothing in the ad copy seems to point to St. Patrick’s Day or Ireland at all.
But it would count as wearing green on that day. #justsayin