Hit 'em right between the eyes
I dunno about other suiters and how technical they get, but generally the "right" way for a suiter to hug someone is to let that person come to them and ask for a hug.
After that it's whatever I guess. I generally do a one arm hug or an over shoulder/arm sort of hug, where it isn't intimate.
wow I've only ever hugged one suit (at an anime con) and I'm glad at least I had the sense to ask before hugging
and it was a full suit, thank fuck