A regular fit shirt typically means that the shirt has a classic, traditional fit that is neither too slim nor too loose. It's designed to fit comfortably without being too baggy or too fitted.
The fact that the shirt is made of 100% polyester means it's a synthetic fabric. Polyester is a common material used in dress shirts, known for its durability, wrinkle-resistance, and ease of care.
The very stretchy quality of the shirt suggests that it has some degree of elastane or spandex added to the fabric, which allows it to stretch and move with you. This can make the shirt more comfortable to wear, especially for activities like dancing, golfing, or other sports
