During the 1881 Childers reforms Regimental numbers were dropped, and the regiment’s county association changed so it now became The Prince of Wales's Own (West Yorkshire Regiment).
These interesting pics (from The Regiment magazine issue 44) show the concurrent us of both traditional uniforms, as well as moving to the Khaki field dress
The Regiment Issue 45 had additional pictures:
The West Yorks were merged with the East Yorks in 1958 to become the Prince of Wales's Own Regiment of Yorkshire, based at Imphal Barracks, York. In the early 2000s I was serving in HMS York (Type 42 Destroyer) and our ship was twinned with the Regiment as a sister. I got to stay at the barracks on a couple of occasions and enjoyed their hospitality (and still have some of the unit insignia gifted to me)
In 2006 the regiment was amalgamated with The Green Howards and The Duke of Wellington’s Regiment to form The Yorkshire Regiment.
A little known fact is that the Regiment also served on Mars, and will be joining my Space 1889 force!