The best replacement for suit is suite.

The best alternatives to suit are rated as following:
★★★★★  suite
★★★★★  tux
★★★  blazer
★★  tuxedo
★★  tux for prom
★  sport coat
★  dry suit
★  criminal suit
★  suit separates
★  3 button suit
★  sportcoat
★  three button suit
★  jacket and tie
  tux rental
  business casual
  tuxedo wedding
  wet suit
  follow suite
  jacket
  separates
  3 button
  warm bag
  single breasted suit
  sport jacket
  sports coat
  ground lease
  sweat
  3 piece suit
  civil suit
  dinner jacket
  no suit
  wetsuit
  2 button suit
  strong suite
  american suit
  indochino
  drysuit
  sport coat interview
  small claims
  tri shorts

Your alternative for suit is not listed? Suggest!
Speaking about suit, one probably shouldn't forget about vest.

Other search terms related to suit and their ratings are:
★★★★★ vest
★★★ no tie
★★★ belt
★★★ tie
★★ sweater
★★ suspenders
★★ sneakers
★★ tails
★★ tie interview
★★ boots
★ bow tie
★ black shirt
★ wrinkling
★ loafers
★ tie wedding
★ brown shoes
★ chucks
★ scarf
pocket square
waistcoat
sweater vest
collar
cowboy boots
white shoes
lapels
tennis shoes
You have in mind a companion for suit and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of suit in all years. Click on graph for more.
suit
suite
tux