Impromptu means doing something without planning or organising. That may or may not be the case when finding something by this clothing brand. Explore secondhand Impromptu clothing. From 1980s vintage to contemporary boutique styles. Look out for extended shoulders designed with a double-breasted cinched in waist. Whatever the occasion - there is an item of preloved clothing out there ready for a new adventure. Discover preowned pieces from this fashion label on Depop now.