because they want to look hot for the girls
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Because players are tackled by manually holding the opposing player it was seen as a strategic move to reduce the leg length of the shorts to limit the material that could be used to retrain the opposing player. In 2007 new shirts were developed and first worn by Wales where the materiel allowed the players skin to "breath" thus reducing desperation and dehydration The shirts were made of a more elastic material than the previous thick cotton worn around the world. This again made the amount of materiel difficult to grasp in a tackle
Also, in Rugby union, some players are lifted into the air by their shorts. Thus, it is very important that the shorts not be too baggy (making them prone to tearing or just not being useful for lifting).
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there are clear, strict requirement's on what can be worn when playing - These are listed in the IRB Rules and Regulations section of the IRB website.
players wear
Boots, socks, swimming trunks under their shorts (provides improved cover if shorts are ripped or pulled down)
Shorts
Rugby jersey
Gum Shield
Scrum Cap or head band
Body armour
In general - Swimming trunks -
Its almost impossible to where "protection" as the discomfort is incredibile -
Boots, socks, shorts rugby jersey and most will wear a swimming trunks under their shorts. Some will opt for a scum cap. In addition some will wear body armour allowed by the World Rugby Rules