The collar is from Walmart. The purple flower is actually an air tag holder from Amazon attached to the collar (we’ve been scarred by our other cat dashing out of the front door and getting lost for a day lol): https://www.amazon.com/dp/B0B121T14R/ref=cm_sw_r_api_i_6RW085CB437R01TYEN26_0?_encoding=UTF8&psc=1
Here you go. You can also plug in 'cat sling carrier' into the search and come up with all sorts of options.
I got them at myrtle Beach BUT amazon is a wonderful place
Pet Lover Pajama Pants – New Cotton Blend - All Season - Comfort Fit Lounge Pants for Women and Men - 27 Breeds Available https://www.amazon.com/dp/B08FXYKYNL/ref=cm_sw_r_apan_glt_fabc_GRJ8A6H7K6CDAQNQVYJX?_encoding=UTF8&psc=1