1. Crew Neck T-shirt: This is the most common type of T-shirt with a round neckline that sits close to the neck.

2. V-neck TShirt: Similar to the crew neck but with a V-shaped neckline, which can be deeper or shallower depending on the style.

3. Scoop Neck T-Shirt: This type has a wider, more curved neckline that often sits lower on the chest, creating a more feminine or casual look.

4. Henley T Shirt: Characterized by a buttoned placket at the neckline, similar to a Henley shirt but with short sleeves.

5. Raglan Sleeve T shirt: These have sleeves that extend in one piece fully to the collar, often with a diagonal seam from the underarm to the neck.

6. Long Sleeve T-shirt: Essentially a T-shirt with long sleeves, providing more coverage and warmth.

7. Baseball T-Shirt: Inspired by the classic baseball uniform, it typically features contrasting colored sleeves and a solid-colored body.

8. Graphic T-Shirt: These T-shirts feature printed or embroidered designs, images, slogans, or logos, serving as a form of self-expression or showcasing affiliations.

9. Pocket T-shirt: T-shirts with a small pocket sewn onto the chest, usually for decorative purposes but sometimes for functionality.

10. Muscle T Shirt: T-shirts with larger armholes and tighter sleeves, often worn by athletes or those who want to showcase their physique.

11. Tank Top (or Singlet): Sleeveless T-shirts with wider armholes, providing more ventilation and freedom of movement, often worn in hot weather or for athletic activities.

12. Crop Top: T-shirts that are intentionally shortened to expose the midriff, popular among fashion-forward individuals or as part of athletic wear.

These are just some examples, and there are countless variations within each category, reflecting the diverse preferences and styles of individuals worldwide.