Yes, it's common to wear a swimsuit or some form of base layer under a drysuit. The purpose of wearing a swimsuit or base layer is to provide a barrier between your skin and the drysuit, which can help with comfort, moisture management, and preventing the drysuit from sticking to your skin. Here are a few considerations:
1. Moisture Management: Even though drysuits are designed to keep water out, it's still possible to sweat while diving, especially in warmer water or during strenuous activities. Wearing a moisture-wicking swimsuit or base layer helps manage sweat and keeps you more comfortable.
2. Comfort: A swimsuit or base layer can provide a smooth surface against your skin, reducing friction and potential irritation from the drysuit material.
3. Ease of Donning: Wearing a swimsuit or base layer can make it easier to don the drysuit, as it provides a surface that allows the suit to glide over your body more smoothly.
4. Hygiene: Wearing a swimsuit or base layer can help maintain better hygiene by creating a barrier between your body and the drysuit. This is especially important if you're renting or sharing drysuits with others.
5. Additional Insulation: Depending on the water temperature and personal preference, you might choose to wear a thermal or insulating base layer for added warmth under the drysuit.
When choosing a swimsuit or base layer, opt for materials that wick moisture away from your skin, dry quickly, and provide a comfortable fit. Avoid cotton materials, as they tend to retain moisture and can lead to discomfort during the dive.
Ultimately, the choice of what to wear under your drysuit depends on factors such as water temperature, personal comfort, and the type of dive you're doing. It's a good practice to try different combinations during your dives to find what works best for you in terms of comfort and thermal protection.