If an American Apparel thermal-lined hoodie fits me perfectly, what size W+H hoodie?

[buyer's remorse]

AA thermal-lined hoodie:

Should I get a small in the Wings & Horns classic fit hoodie? Or a medium or small in the slim fit?

I keep reading about how the classic fit hoodie is baggy, and that is one of my main gripes about most hoodies. But looking at these pics I found of the slim fit, it looks like it might be too slim in the torso (and I'm worried that sizing up will make the shoulder areas too baggy...I also always wear my hoodies zipped up):

[buyer's remorse]

Okay, I just found some width measurements for both the classic fit and slim fit and they're both the same! What's the difference then? Slim fit just has slimmer sleeves?

[snugglepony]

what size AA thermal hoodie do you wear?

[buyer's remorse]

I wear a small. 18.5 inches exactly from armpit-to-armpit.

[Servo2000]

Please, in the future, THIS IS THE WRONG FORUM FOR SMALL QUESTIONS.

Please take your questions to SuperShopper and post in the very specifically titled Small Questions thread.

[buyer's remorse]

Whoops, sorry, my bad.