I only own a Washington fit tuxedo, but I took a 42L and the pants fit with a hem and very light taper.Hmm... I've been eyeballing the cigar linen suit in my size, but there's only a slim available (really left it quite late). I enjoy the slim jacket, so no questions there, but the trousers is my worry. I haven't purchased S&M trousers before, but have read copiously here that contemporary is the way to go if you want a good silhouette. In saying that, I compared the measurements of the slim high waisted trousers to my best fitting suitsupply Washington trousers, and there's hardly a difference? My no means are my Washington trousers hugging my legs, on the contrary they have a fantastic drape (luck I suppose with the inconsistencies of suitsupply). In saying that, the rule of thumb seems to be to go contemporary, but the size chart speaks otherwise?
For Spier and Mackay I prefer contemporary, primarily for the rise. I own and can wear a 34 slim high rise, but much prefer a 35 contemporary taken in 2 inches in the waist. Your results may vary but I have always considered myself a pretty normally built 6’2 185 who would reach for a slim in other brands, so hope that helps.