We know of one original International shirt which is still available to view and that is the white cotton England shirt worn in the first International between Scotland and England in 1871. The shirt is part of an exhibit in the RFU museum at Twickenham stadium.
Today the majority of team shirts in the top echelon countries club teams now carry sponsor logos this even applies to amateur clubs who rely on sponsor monies to support their clubs, these logos appear on the front, back, sleeves and even collars they vary in size with the largest being the main sponsor. Replica shirts from all the major clubs are available to the general public and popular as casual attire due to there good quality and style.
Shirts are usually numbered 1 to 15 for the starting fifteen and then 16 to 22 or 25 for the substitutes. Substitutes in rugby are governed by the game being played and can be as few as 3 or maximum of 8. The numbering system has evolved rather in the same way as with other team sports and apart from a period when some clubs used letters Leicester probably being the best known numbering has now become the norm. The Premier sides will usually now also have the players name above their position number for the 1st fifteen on the field of play.