Final answer:
The first item of clothing to put on typically is underwear, as it is the foundation layer and assists in maintaining modesty when helping someone dress.
Step-by-step explanation:
When helping a person to dress, the correct sequence is important for comfort and ease. Typically, the first item of clothing that should be put on is the underwear. This is because underwear serves as a foundation layer that is closest to the body and is usually covered by other garments. If a person is immobile or has a limited range of motion, starting with the underwear can also assist in maintaining modesty as further layers are added. Other items such as pants, socks, and a sweater would follow after the underwear.