window dressing

Short definition from Wiktionary

Noun

1. 1
   The decorative display of retail merchandise in store windows; the goods and trimmings used in such a display.
2. 2
   The process, skill or task of creating such a display.
3. 3
   A means of creating a deceptively favourable impression of something or someone; something for appearance only.
4. 4
   Alternative form of window dressing.