dressed up like a dog's dinner

/D R EH1 S T AH0 P L AY0 K AH0 D AO0 G EH0 S D IH0 N ER0/
adjective
  1. 1

    Dressed in an ostentatious or overly formal manner.

Source: https://en.wiktionary.org/wiki/done%20up%20like%20a%20dog's%20dinner, https://en.wiktionary.org/wiki/dressed%20up%20like%20a%20dog's%20dinner