Swarm

"Swarm behaviour, or swarming, is a collective behaviour exhibited by animals of similar size which aggregate together, perhaps milling about the same spot or perhaps moving en masse." (Wikipedia)
Stitchtags are swarming this summer.
Many of us swarm towards the latest trends in fashion.
The life cycle of fashion starts with seasonal collections.  We only see butterflies in the warmer months.
Fashion can be fleeting, like a butterfly some clothes and trends only last for a few days, some might survive a few months.
The old clothes used in swarm are undergoing a metamorphosis; finding a new life as seasonal, swarming butterflies.