You felt a strange compulsion to try the uniform on. Why not? You had the room to yourself. Hell, you didn't even know what day it was, it could easily be a school day for all you knew.
You went to put on the white shirt, putting your arms through the sleeves and buttoning the stiff cuffs neatly around the wrist. You then button the front of the shirt up, doing up your top button, and noticing the snug fit this has around your neck, arousing you. It would be even better having to wear it when you don't want to.
You pick up the grey, pleated shorts and button them up, and tuck your shirt into them so it looks smart, you then grab the regulation belt that is part of the uniform and put it on. After this, you put on the grey, knee high socks then notice something is a bit odd - if you are sixteen, why do you have a uniform with shorts? British secondary schools almost never allow boys to wear shorts, even in summer. The closest you'd have is perhaps a prep school that ran to ages 12-13, but no further. In some schools, boys have even protested by wearing skirts!
You brush the thought aside however, as you eagerly pick up the tie and tie it. It's pretty simple, it's like you've been doing it all your life. You lift your collar up to fet the tie on, then neatly fold it down, adjusting it, being aroused by the feel of a stiff bit of fabric around your neck. You then put on your black school shoes, then finish with the crowning piece - your blazer.
You turn to look at yourself in the mirror, and the smart schoolboy looking back, but something doesn't add up. You're shorter. Your features are softer.
You curse to yourself, but realise your voice is higher pitched. You couldn't look any older than thirteen. It all makes sense now, why you had shorts instead of trousers. Your head feels different, your cognition rescinds to the level of a young teenager. New thoughts come into your head, you're in year eight at a private prep school. Your parents are reasonably well off, you're quite intelligent, and not unattractive by any means. You are aware that you got dealt quite a good hand in life.
But forget all that - you are so preoccupied with how amazing the uniform feels on you, you love wearing it, you feel proud to represent your school, you rarely even take it off after school, keeping it neat with the top button done up, sleeves rolled down, shirt tucked in.
Whilst admiring yourself however...