Ervell designs for his own body type, which is "nerdy". I have had a few conversations with stockists and fashion friends of his. Essentially, if you are skinny, and have a sort of pencil neck, it will work great for you. If not, the knits might work pretty well since knits stretch to fit, within limits, but most things, not so great.
Yeah, Ervell's pieces do fit to a certain body type/aesthetic.
Which is why I'm so interested in them/wear a whole lot of it.
It's suited for a thin frame / slim and cropped style, and like LAGuy says, the knits and such overall are pretty universally good fits.
When it does come to some of the outerwear/shirting sizing however, that's when it starts to stray away and be a bit different.
From me experience though, I think I personally fit fairly well with what he has to offer!
Also Mikey I think you would also fit it pretty well! His knits are really great.
Ervell Loyalist. \m/
The majority of my wardrobe is Ervell. I'm 5'9, pretty skinny/ectomorph, but not stickman skinny. I can say this about Ervell (from experience): Ervell is designed for skinny guys of medium height to tall. The look on tops and outerwear is, on SOME pieces, supposed to be slightly undersized and cropped. If you're tall and the piece is too short, size up. If it is still too short, you've got a long torso. Button-down Shirts fit TTS, but neck openings can be small.
I've always found that Ervell works well with aggressive styling. Some Skinhead and more militant stylistic leanings lend themselves well. The look does not work well for shorter guys or thicker guys.