What to wear in Singapore in winter

Girls, basically, shorts, T-shirts, skirts, suspenders, boys one and a half pants, T-shirts - this refers to the outdoors, but Singapore has cold air everywhere, it is very cold, very cold, so indoor wear long-sleeved is also normal, if it is a job, the girls are generally wearing a more formal, the boys are generally shirts, or with a collar of the T-shirt.