See comments on Wetsuits about built-in liners (but there are many wetsuit users who do like such liners)

• Discussion
  • Discussion 1/15/2019
• Stores/Brands many major wetsuit brands also offer rashguards, but you don't necessarily need to rely on such purpose built options. Many well sewn synthetic shirts, and long bottoms or running tights without prominent seams or labels that might otherwise rub or chaff can serve well as rashguards.
  • JLRowing
  • Wetsuit Wearhouse