If you typically size to M in dress shirts

with a standard GSM weight suitable for year-round use

Check your usual collar size

These work best as your bridge piece between casual and semi-formal

go down rather than up—the slim cut is designed to sit close to the body

Basics Muscle Fit Deep Sea Cotton Polyester Crew T-Shirt 21BSH47831 If you typically size toA muscle fit t shirt in Deep Sea, built from a cotton polyester blend that balances breathability with durability. The fabric weighs 180 GSMsubstantial enough to hold its shape through regular wear without feeling heavy in Indian summer heat. The cotton polyester construction resists wrinkles better than pure cotton, which matters if you're wearing this to office or casual meetings without immediate ironing. The crew neckline sits clean and won't