1. It can be Keralites (people from the state of Kerala in India) dressed in thobe.
2. It can be keralite-Qatari. their grandparents or parents must have come here long time ago and settled. Yes ,they hold Qatari Passports. No one can be called a Qatari unless he/she holds the citizenship.
3. It can be the God who has given him/her keralite look.
4. If ur refering to a female , then it must be that she is a keralite and got married to Qatari.