A three-button shirt is often called a Henley or a polo shirt, depending on the style. Henley shirts feature a round neckline with a placket of three buttons and usually don't have a collar, making them a popular choice for casual wear. Polo shirts, on the other hand, have a collar and a three-button placket, offering a more classic, semi-casual look. Both styles are available in short or long sleeves and come in a variety of fabrics, so you can find options that suit different occasions and comfort preferences.

Three-button shirts can be a great choice for work, especially if your workplace has a business casual or relaxed dress code.

• Polo shirts with three buttons and a collar offer a polished look that's suitable for meetings or office settings.
• Henley shirts are more casual but can work for creative or less formal environments.

Leaving three buttons undone on a shirt is generally considered too casual for most settings.

• For polo or Henley shirts, it's common to leave the top one or two buttons undone for comfort and style.
• Leaving all three open can make the shirt look overly relaxed and may not be appropriate for work or formal occasions.

The term 3XB refers to a men's shirt size, specifically 3X Big. This sizing is designed for individuals who need a larger, roomier fit, especially in the chest and waist areas.

• "3X" indicates the shirt is three times extra-large.
• "B" stands for "Big," which means the cut is more generous compared to standard sizes.

Choosing the right size for a three-button shirt is all about comfort and fit.

1. Start by measuring your chest, waist, and neck with a tape measure.
2. Compare your measurements to the sizing chart provided on the product page.
3. Consider if you prefer a regular, slim, or relaxed fit—this can affect how the shirt feels and looks.
4. If you're between sizes, think about whether you want a looser or more fitted style.