The best replacement for swimsuit is bikini.

The best alternatives to swimsuit are rated as following:
★★★★★  bikini
★★★★  bathing suit
★★  swimwear
★★  swim suit
★  board shorts
★  underwear
★  leotard
  tri suit
  swim trunks
  swimsuit
  wetsuit
  tankini

Your alternative for swimsuit is not listed? Suggest!
Speaking about swimsuit, one probably shouldn't forget about tummy control.

Other search terms related to swimsuit and their ratings are:
★★★★★ tummy control
sarong
You have in mind a companion for swimsuit and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of swimsuit in all years. Click on graph for more.
swimsuit
bikini
bathing suit