The best replacement for old navy is gap.

The best alternatives to old navy are rated as following:
★★★★★  gap
★★  aeropostale
★★  american eagle
★★  new navy
★★  h&m
★★  old navy outlet
★  uniqlo
★  gap quality
★  american eagle jeans
★  banana republic
★  children's place
  j crew
  kohls
  kim kardashian
  baby gap

Your alternative for old navy is not listed? Suggest!
Speaking about old navy, one probably shouldn't forget about maternity clothes.

Other search terms related to old navy and their ratings are:
★★★★★ maternity clothes
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