Hi aspirant!

You can definitely wear a half sleeves shirt or tshirt and jeans or trousers according to the JEE Advanced advisory. Make sure that the clothes do not have too much pockets in them. Do not carry any accessory.Belts and broaches are not allowed. You can wear analog wrist watches but the digital or smartwatches are not alllowed.Don't wear shoes on the examination day,shoes are prohibited.Wear slippers or open sandals.Ihope it helps you.

All the best!