While scanning the perfectly stocked shelves at Uniqlo on 5th Avenue, I was impressed with the small tweaks and attention to detail. One style had pearl buttons and chest stitching for a "western" look; another was a series of v-necks with striped collars.
These are the three I picked up yesterday, but Selectism has photos of (most) of the overall options, for your perusal. And Uniqlo has a somewhat limited selection that you can purchase online.
Listen, you're getting Michael Bastian's expert eye and design aesthetic at a great price, so grab a few of these + enjoy them this summer!