It would be really great if there were some sizing suggestions or measurements for all the pieces that don't require you to know your size in other possibly idiosyncratic pieces ... I own no Schneider at all, so knowing that this season's foo is slimmer than last season's bar is not useful. Some people in the Schneider thread have dropped a few hints, but (speaking as a newb) it's kind of alienating to have to hunt for that kind of info.
Could you give us some details (height/weight) and your preferred measurements (e.g., 18" shoulder 20" chest for outerwear...) and we can chime in if we are similarly sized and let you know what we wear. Schneider thread might help with this too.
We're here to be codependent with you!
Edit: I can work this in reverse of course, on the off chance it's helpful: I'm about 6' and typically go with outerwear with a 18.5" to 19" shoulder and 22/23" chest half measure. I wear a size V in SS sweaters and coats.
The one size V shirt I've tried didn't work so well for me. Just not a comfortable cut. I feel as if the way SS designs outwear is a little more forgiving.
Can't speak to trousers. Never tried them.