D11 ,D9, D5, etc...are various grades of Anti radiation suits. You will never get it in open market. For that you need to contact BARC or DRDO. These institutions will only provide these type of suits to companies working with radiations and holding proper licenses.

So stop searching here and ask your contact person to approach the above given authorities.And never post such requirements in the forum , it will be a BIG JOKE for everyone here.