HLN has a simple and straightforward dress code for all students:
- Solid-colored shirts with short or long sleeves and a collar (polo, dress-style with button, or turtleneck).
- Pants, shorts, capri pants, skirts, skorts or jumpers in the colors of navy blue, black, or any shade of khaki. Hem should be no greater than 3 inches above the knee.
- No athletic clothing or denim is permitted.
- Sweaters must be a solid color with no logos, emblems, or messages written on them. A collared shirt (in accord with the guidelines above) should be worn under the sweater at all times.
- Shoes with non-marking soles are necessary for play in the gym.