swishing

Short definition from Wiktionary

Verb

1. 1
   present participle and gerund of swish

Noun

1. 1
   The sound of fabric or fur moving in the air.
2. 2
   The movement that produces such a sound.
3. 3
   A switching; a beating with twigs.
4. 4
   The mutual exchange of pre-owned clothes, especially at an organised party.