You cannot ask the internet sizing questions. Full stop. Quit it. Sweaters are especially terrible in this regard as they can stretch. You got questions about that? You try it on in person or refer to the website for fitment help.

There are technically zero trustworthy sites as every site can feature fraud. Don't look at amazon, look at EVERY site.

Genuine Aran. There is no such thing. Aran is not a Vidalia Onion where its a specific type of onion grown in a specific region. Aran means many things to many people. A holy shit red cardigan dress from Burkina Faso could be called an Aran Sweater and feature a large Irish flag tag stating so. And it would be fine. Aran can refer to:

1. A country of origin (or not)
2. A color palette (or not)
3. A weave type (or not)
4. A style (or not)
5. A wool fabric (or not)

So using the above, ANYTHING can be called an Aran Sweater as there is no standard. In fact, what I had for dinner this evening, I'm now going to call an Aran Sweater because I can.