Hey there .

Yes you can wear a skirt or frock without buttons. It shouldn't be full sleeves and you should be comfortable enough to be sitting for 3 hours in that dress and write the paper.

Decency and comfort should be always kept in mind when it comes to what should I wear for NEET exam. You should follow the guidelines provided by NTA regarding the dress code.

For the latest updates and important guidelines,  you can visit the link mentioned below.

https://medicine.careers360.com/articles/neet-dress-code

Hope this was helpful.

Thanks