Older teen onesie where is best to buy?

[ZNation]

Looking for a older teen onesie who is in small men's size but can't seem to find onesies in the shops as the hooded blankets seem to be popular at the moment.
Does anyone know where I can get a fleece onesie in a men's small size ? Thanks

would this one work?
www.amazon.co.uk/Mens-Cargo-Onesie-31B1535-Olive/dp/B08LKZMB2G/ref=asc_df_B08LKW12YR/?hvlocphy=1007097&linkCode=df0&hvptwo&psc=1&hvnetw=g&hvadid=482327458685&hvpone&hvlocint&th=1&hvpos&hvdev=c&hvdvcmdl&hvqmt&tag=mumsnetforu03-21&hvtargid=pla-1032614620535&hvrand=946877306923868047

I got one for my teen son from Next, it's plenty long enough for his 5ft 10" frame.

On the Next website, if you click on the ‘size guide’ on any older boys’ clothing, it says that a boys size 16 years is the same as men’s small for tops and 32” regular for bottoms. Next has a fair few boys fleece onesies www.next.co.uk/g794603s2/268889#268889