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. Clothing that you have acquired for sun protection likewise may serve as rashguards if you find they are smooth and do not cause irritation when worn under wetsuits.
  • JLRowing
  • Wetsuit Wearhouse