If given the choice, smaller children would pick t-shirts with their cartoon characters or recent movie characters on them. If possible it can match the pillow case, sheets and curtains already found in the child's room. These character inspired designs are really easy to find and relatively inexpensive at large box stores like Wal-mart and Kmart.
If however you are buying clothes for tween and teens, you can almost always expect to pay more. They usually are through the cartoon phase and turn their attention toward bands, personalities or fashionable designer labels that will cost more. This type of tees are also not immune to good prices and nice quality if you do some shopping around, especially in web stores and sites.
A good T shirt is a popular present. A nice Tshirt will make anyone thrilled as a holiday gift.