There are limitless styles and designs to choose from, so it's not hard at all to find something for your wardrobe. You should have a few casual shirts for every season.

Since mens hoodies & sweatshirts can be long-sleeved, short-sleeved, or sleeveless, you can find some that can be worn all year round. 

A button-down polo shirt is a great choice for spring. This type of shirt can be worn with anything, including jeans, shorts, skirts, and even dress pants.

For chilly days, you can add a sweater or jacket with your outfit and everything will still look great! However, you need to make sure all the colors match, and this can be done by buying a few polo casual shirts in different colors.

Sleeveless styles are great for hot spring and summer days. There are plenty of sleeveless muscle tops for guys and halter tops for women

 No matter what size you are, you can find the right muscle, halter, or tank top that will look great on you. Once you find a sleeveless shirt that looks great on you, orders a few more with a similar style but in different colors. That way, you'll always have casual shirts to wear on hot days that will match the rest of your outfit.