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I’m not sure how much shrinkage you get with your SEH shirts but ours shrink c.3% in their first wash and then, if anything, give slightly after 4-5 more washes. We’ve built a shrinkage allowance into the sizing though with an explanation when you get the shirt etc. We don’t use sanforized (pre-shrunk) linen cos tumbled gives it a softer handle at the weight we use. Very happy to give size recommendations if you’re interested :)
I've had problems with shrinkage of linen shirts in the past, SEH in particular.
Always washed no warmer than 30º, hung to dry.
Would your heavier weight make any difference, or is yours pre-washed?