you can download the full collection here
https://bergdorfsims.tumblr.com/post/622115632675274753/saint-laurent-ss20-collection-this-set-was
you need this mesh
https://www.thesimsresource.com/downloads/details/category/sims4-clothing-male-teenadultelder-everyday/title/chloem-resort-style-blouse-male/id/1452981/