Reiss sizing

[PaschaPenny]

I’m thinking of ordering a suit from Reiss, not somewhere I usually shop. Can anyone help with the sizing? How does it compare to Whistles or Jigsaw?

I’ve googled and it suggests that the sizing isn’t generous. Would people automatically go up a size in Reiss tailoring?

I find it's pretty true to size. I'm an 8 in Jigsaw and most of my clothes from Reiss are a small (8-10). I also have a dress in an 8 and another in a 10.

Thank you @GreaterCassowary . I might buy two sizes and see which I prefer. I think I find Jigsaw a bit smaller than Whistles generally, so I might need to go up a size in a slim cut suit.