Some people do that but I would avoid that. A trilam drysuit is very expensive, it can get damaged even just by mistake when you are dressing up. Why using a trilam drysuit in the Red Sea? You could almost swim naked there, or use a 3 mm Decathlon crap wetsuit just to protect the skin from fire coral contact or to have a light thermal protection. The same in Italy in the Mediterranean. Some people use trilam drysuit in summer but I would avoid that. 5mm wetsuit for me...I would use a drysuit only when diving in full winter or in the alpine lakes. Very rarely I could plan trips to the UK or Ireland or Sweden, I would be curious to do some dives there. Anyway mostly I wouldn't use a drysuit for travelsI ven know a number of people who use Trilam' drysuits for the redsea. Warmth, convenience, weight.