I bought sleepsuits for my husband and found them useful. This is where I got them but I’d imagine there will be other suppliers. As suggested it might be an idea to phone a supplier and talk to them about their product.
Men's Sleepsuit | Sleeping Suit For Men | Adult Sleepsuits | KC Sleepsuits
Men's sleepsuit made in the UK. Zip back anti-strip design. Long or short sleeve with elasticated waist & ankles. 34" to 47" chest.
www.shop.kcsleepsuits.co.uk