Is there anyone here starting his/her training on 1 Feb? I got an email stating that mine will begin on 1 Feb, batch 903!

I'm a guy and wondering if we can wear just polo t-shirt/short sleeve shirt and jeans/pants for training or must wear corporate ie. long-sleeve shirt, tie and pants only. Apparently the email included the grooming standard stating that males are only allowed to wear corporate attire during training. Before I go off and get more ties (I have enough long-sleeve shirt and pants already), I thought I better check if the rules are relaxed for training.
Appreciate any help thanks!