That must have been uncomfortable to wear a baggy uniform. Like you, I am particular with the fitting and that's the advantage of having clothes made because it's supposed to seamlessly follow one's body shape and create flattering silhouettes. It's good that your aunt rectified it.
Since moving back to the Philippines, I have only purchased a few plain white or black t-shirts but even then, I'd put them back on the rack inside a fitting room if the fitting is questionable.