Dress code for NEET - Candidate must be wearing light clothes. Try to avoid full sleeved clothes. Also if any candidate come  in customary dress, he/she should report an hour before for proper frisking. 

Footwear- try not to wear shoes. Sandals, sleepers with low heels are allowe. Also don’t wear any metal or steel related pins in your hair.

There is no problem if you are wearing a dress which have neck but try to avoid high neck Or a dress with high collars which will restrict your neck area. Try to abvoid any such kind of clothes which may be objectionable and serve as a hinderance for you while checking at the exam centre. I hope your all queries is been resolved by this information. All the best.