why is building up to full uniform/padding a good idea in preventing heat illness during practices?

Building up to full uniform, especially in contexts like sports or activities involving heat and heavy gear, is primarily about acclimatization. This means gradually getting used to heat and exercise intensity before wearing the full heavy gear or uniform, which helps the body adapt better to heat and prevents heat illness during practices or exertion. It allows physiological adjustments to manage heat stress safely. In another context, "building up to a full uniform" in terms of fashion or style refers to gradually creating a personalized, consistent wardrobe or "style uniform" to reduce decision fatigue and create ease and confidence in outfit choices. But fundamentally, in health and sports safety, the primary reason for building up to full uniform is to prevent heat illness by acclimatizing the body to both exercise and heat while wearing the gear.