The Tiger Men of the Boxer Rebellion wore tiger suits as a way to give themselves the strength of the tiger.
Some of their wicker round shields were painted with the symbol for bravery and strength.勇yong3, others were painted with pictures of fierce tigers
I no longer have the book I found the above information in and will try to get it back for a friend so that I can give you the reference for the above.
They had no real uniform, most wore some sort of red sash, or bandana tied somewhere on themselves.
I've only seen one picture of the tiger suit and it appeared to look like the hats Chinese children wore for protection.

The characters on the banner are too blurry for me to make out. Can anyone read them?
The boxers grew out of the popular culture of North China and developed from various different secret societies composed mainly of young Chinese males. What they lacked in leadership they made up for with a fanatical zeal in their desire to rid China of all foreigners and to replace the ruling Manchu’s, who they viewed as foreign usurpers. As the movement expanded, new groups identified themselves with one and other Chinese Trigram. The most common being the kan and qian trigrams. They imitated the dress of martial arts performers but distinguish themselves from the masses by wearing special items of clothing. The kan trigram wore red caps or turbans, a red sash or scarf and red leggings or ankle strap The qian trigram Boxers preferred yellow. A village would have a single Boxer unit or tuan of anywhere from 25 to 100 men, with larger settlements having more units. Each unit was led by a Senior Brother-Disciple(da shixiong), chosen often because of his superior boxing skills. The rest of the unit were called Brother-Disciples(shixiong). There was a distinction between Military (wu) units and civil (wen)units. The latter being composed mainly of educated persons. The Red Lanterns (Hondengzhao) were female Boxers dressed entirely in red and were found mostly in the area around Tientsin.
At the beginning the Boxers were armed with primitive weapons including long swords and knives, and ancient firearms. Each new recruit hat to undergo an initiation rite involving the learning of incantations. Once he reached the stage of being ‘under the spell’, he was regarded as being immune to bullets, usually demonstrated to the uninitiated by firing blank bullets at his body. These demonstrations often took place at boxing grounds established throughout the country.
Osprey Military book#85, 'Peking 1900, The Boxer Rebellion'

On the left are two infantrymen of the imperial army, while next to them is a drum major of the regular army. Seated on the trunk is a field artilleryman while the figure in the foreground on the right is a boxer.(the Boxers apron would have been red)