Being small sucks. Big time! At 4'11", it's awful.
Three quarter sleeves and trousers fit me full length and I get to see up everybody's noses.
I have met people 'in charge' who are smaller than me and they all seemed to have the same characteristics.
Slim. Nothing says 'in control' like being slim.
Smartly dressed. Proper suits, proper blouses/shirts, proper ties/necklaces and proper shoes. Not high fashion, but stylish. They looked like grown ups.
On the weekends, when we worked together and the dress code relaxed, when everyone else was in jeans and T-shirts, they dressed as if going for a country walk.
They acted like responsible grown ups. They were polite, but serious. There was no laughing out loud or silly joke telling. They acted like they were grown ups, commanded respect and only 'let slip' on tea breaks or clicking off.
They were authoritative and well spoken. Knew their stuff, spoke clearly and made sure people knew that they were professionals.
I was jealous. 
I'm overweight, smart casual is my default setting and I'm in no way 'serious' enough to be taken seriously.
Get thee to Hobbs. Lose weight if you're overweight, work on a 'grown-up' look and demeanour and don't send round robin emails about gossip....