The page you posted has 3 pictures on it, 2 from Empire at War (The least acurate SW game in existance) and one picture from a New Hope showing the Alderaanian royal guard. Not much in the way of evidence imo.

So unless I'm mistaken the concept of rebel troops in alderaainin uniforms is entirely made up by other SW games. I haven't watched the movies in a while so I may be missing seeing rebel troops on home-one or Yavin base

General Un-Co,
                         Signing off

If you have read the information, you would have understood. Not all of the troopers had the uniform we see on Tantive 4.

The task of supplying all Rebel troopers with standardized uniforms on a galactic scale was nearly impossible. Nevertheless the Alliance to Restore the Republic Army was able to implement a 'standard look' that would help identify the troopers as Rebels and therefore also improve morale and unit cohesion. The large helmets with neck guards and khaki uniforms became some of the trademarks of the Rebel / New Republic uniforms.

Rebel troopers of various units spread across the galaxy were often equipped with uniforms bearing a striking resemblance to the uniforms of the Alderaanian armed forces. Evidently Alliance sympathizers within the Alderaanian government helped fund, train and equip many militant groups outside the Alderaan system. The unadmitted military support of the Alliance was to such an extent that it helped shape the look of Rebel troopers for years to come. Even after the Destruction of Alderaan in 0 BBY, and perhaps because of it, many Rebel units began showing up in uniforms greatly inspired by the former Alderaanian armed forces.

The Alderaanian looking and most common uniform of the Rebel troopers consisted of blue shirts, black combat vests, grey trousers and black calf length boots. To protect officers and general infantry from head injuries, white blast helmets with blast visors and extended neck guards were issued as standard headwear. This basic uniform was seen all over the galaxy, often with smaller differences in design and coloring. Troopers who operated in more harsh environments such as hot deserts, icy planes or thick jungles, would often be equipped with more specialized uniforms and equipment. These uniforms were often similar or comparable to those of the SpecForce Wilderness Fighters

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