Why did wales rugby play in yellow tonight?

Answer 1

The Yellow strip is sponsored by Brains SA (a Welsh Brewery) The WRU have to meet a specific contract agreements when the shirts are bought in - In this case it is representing Brains Gold (therefore the shirt colour).

In many sponsored games these days the sponsor demand logos on shirts in specific places, can demand a specific strip is worn and the pitch-side displays are within TV camera view so that the viewer sees that advert for product X continually. Sponsorship can bring in very high revenue in the majority of sports

Answer 2

The Lions first wore their traditional colours on the 1930 tour: red jerseys, white shorts, blue socks and green stocking-tops, to represent each of the four represented Unions which are Wales, England, Scotland and Ireland respectively.

Answer 3

The didn't originally however, the red was adopted to follow the Red Dragon seen on the national flag