Reddit mentions of Amazon Brand - Goodthreads Men's Slim-Fit Short-Sleeve Printed Poplin Shirt, Navy Cactus, X-Small

I've had a lot of success with Amazon's Goodthreads line for pants! They carry a really wide range of sizes that typically aren't available in stores, down to a 28x28, and have a bunch of different cuts & colors. Plus you can do Amazon Wardrobe if you have a prime account, which is a lifesaver if you feel awkward shopping in the mens or boys section in stores. I own like five pairs of their skinny fit chinos for work. (For reference, I'm 5'6" & weigh ~135, and I wear a 29x32 but tbh I probably wear my pants too tight hahaha. Also I've found that the chinos tend to shrink a bit in length with washing & drying, so it's better to go a bit long.) I also just figured out that some of their printed dress shirts seem to be purposefully designed to pair well with the chinos--I bought this cactus print shirt & realized that the green cacti perfectly match the olive chinos, which made me feel super put together when I noticed at work! Obviously not exactly formal wear, but if you need anything in the business casual realm, highly recommend.