Hey Denis - I did have to redye the belts due to mild sun fade (western PA). They were turning a deep blue. I used "Rit" in hot water, stirred regularly, for 2 sessions of 1 hour a piece. I couldn't get my field stove working so the Mrs. kindly allowed me to use her stove.
I did not need to resew seams or tags - they were in nice shape. I only dyed up to the tags so as not to get dye on them.