Caution: Explosive. Handle with care.
'Idhuvum Kadandhu Pogum "
Even this challenging situation would ease
Frankly writing. Hope you won't mind. By looking at your profile photo, we can say that the boy is correct to address you as Aunty. For a matured person, you could be Didi (Sister), but for any young boy or girl, you are surely an Aunty to feel proud. The synthetic or silk or fancy or cotton materials doesn't matter. Its fitness and the way of wearing it matters lot. The look of the face and the body shape is an important matter to address a person.
No life without Sun
Generally cotton sarees with border with design or design are preferred by ladies around 50 years. Cotton print and fancy sarees are preferred by the ladies below 50 years. In our house also my mother, my wife and my sister prefer these cotton sarees. Others prefer cotton print or fancy sarees.
As you have mentioned because of change in your dressing the boy might have addressed as aunty. next time you try your usual dress code he may call you back as Didi.
Some people due to their physical appearances look more aged than what actually they are and in such cases dress may not mislead the people in judging the age.
There are people who look younger than their actual age and these are the ones who have biggest advantage with appropriate dresses to look more younger.
Knowledge is power.