The Lexington School's dress code requires slacks, pants, or school appropriate length skirts/shorts, in solid khaki, navy, gray, or black, along with any solid-colored collared, button-down, or turtleneck shirt. Solid-colored fleece with collars, jackets, or sweaters may also be worn. Students are allowed to wear solid colored crew neck sweatshirts with a collared shirt underneath. TLS branded sweatshirts or hoodies are also acceptable, but hoods must be kept down while students are inside. Unless, TLS branded, all clothing items should be devoid of pictures or patterns. Patterned tights are allowed in Preschool only. Acorns students will follow the daily uniform in solid colors but are not required to have collared shirts. Leggings must be worn under clothing (they cannot be worn alone as pants). Outerwear need not follow the solid-color rule unless it is worn inside the building.

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Any solid-colored, jewel-necked, or collared dress/jumper are okay on any school day. Belts must be worn if belt loops are visible. In Preschool, the Daily Uniform will be worn Monday-Friday. Belts are discouraged in Preschool, and shirttails do not need to be tucked in. Straight hemmed shirts such as polos or blouses may be worn outside of the waistband but must be appropriately sized. All button-down shirts or those with long shirttails must be tucked in. The Friday Dress Uniform may be worn on any school day if so desired.