Wearing shirts that fit is a bedrock rule of the new menswear order. Hugh & Crye even made it their mantra. There's a place for baggy, Mercer-style oxfords, and purposefully "off" shirts like those from Engineered Garments, but the full-on drop-shoulder gap-collar sloppy-blousing dress shirt has been banished by closer cuts, darts, and cheap made-to-measure (a risky business--a topic for another time). Individualized Shirts is a large MTM factory in New Jersey that also does a decent amount of business making ready-to-wear shirts, often for the Japanese market (Individualized shows up in Free & Easy and on Japanese store sites). Sweetu Patel of the esteemed Clinton Hill Classic Menswear has been selling off-the-rack Individualized Shirts (generalized Individualized?) for a couple of seasons in a house cut that's trim, with short-ish shirttails, narrow arms, and small, pleasing details like third collar buttons and rounded collars.
Patel's new fall shirts keep plaid alive. The fabrics are large patterns that aren't concerned with perfect symmetry over the body of a shirt. Colors are unusual but not outlandish. Collars are rounded and buttoned, and the chest pocket closes with a button also (no flap). Two of the shirts subtly trade fabrics for the cuffs. Two things I'd tweak were I ordering these custom: swap out plastic buttons for mother-of-pearl and make the collar a little larger--the shirts I've bought from Sweetu have small collars that look good but don't roll the way I roll.