Here it is https://www.target.com/p/boys-short-sleeve-flip-sequin-t-shirt-cat-jack-153-aqua/-/A-54214017?preselect=54165245#lnk=sametab

Just bought onr for my ds at target. Your ds is 4 so you would need XS or S most likely and it may be a little big.
The beetles' wings are flip sequins - one side silver, one side gold. My ds loves it.

I saw some at Target in the boys department

Carters has some with dinosaurs and words that flip.

Boden has some, too.

Oshkosh has them for boys - pizza, ninjas, rocket ships, etc.

https://www.amazon.com/dp/B07MC7QD7W/ref=twister_B07G85KNM1

Oh my goodness- thank you DCUM! You are awesome, my son will be so thrilled

Boy Wonder hasn't started production yet. I can't wait though!

H&M has NASA ones. Lands End has chameleons. (both for flippy sequins). They also make pillows, which my boys fall asleep petting mayn nights.

H&M has a couple
https://m2.hm.com/m/en_us/productpage.0738856002.html
https://m2.hm.com/m/en_us/productpage.0739822001.htm
And I think there's one with a police car.

Do you mean the "flippy" sequin t-shirts? They have some cool Star Wars ones at the Gap--they're in the boys section, although I got one for my daughter.

https://www.gap.com/browse/product.do?pid=465903012&CAWELAID=120280880002753425&CAGPSPN=pla&CAAGID=59544514997&CATCI=pla-532343177177&tid=gppl000013&kwid=1&ap=7&gclid=Cj0KCQjwocPnBRDFARIsAJJcf97IAdNSx-28PP6px5Gsbd2VgTtkJV5yRQC_Wo41OzdT6TD7_uT8dvwaAq3KEALw_wcB&gclsrc=aw.ds

I remember hearing about a company that makes these kinds of clothes.... Boy Wonder I think?

Gap has some ....not spakle - but the flippy sequins

https://www.gap.com/browse/product.do?pid=479941012&cid=1122119&pcid=1122119&cpos=18&cexp=917&cid=CategoryIDs%7C1122119&cvar=6498&ctype=Listing&cpid=res19053106640227927658813

Op here, and he prefers the mermaid sequin sparkles that can change color

My 4yo son has been asking for one forever, but I haven’t been able to find one that is not a girl-cut or is over the top with pink/purple. He likes blue, green, white, red.