衣着得体的英文表达是 "Dress appropriately" 或 "Be well-dressed"，注意仪表的英文表达是 "Pay attention to personal grooming" 或 "Be mindful of one's appearance"。所以，如果要表达 "衣着得体，注意仪表" 这句话，可以改为：
1. Dress appropriately and be mindful of your appearance.
2. Be well-dressed and pay attention to personal grooming.
