I'd second all those who are saying sew first, felt after. It makes the seams fantastically strong, surprisingly neat (which I love as I'm a messy sewer), and I've never had trouble with puckering.
And as you are doing the felting (whether by hand or by washing-machine), you can check as it goes along whether it is closing or not, and ease it open - though I've not had this problem with buttonholes, either.
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Date: 2012-01-25 04:14 pm (UTC)And as you are doing the felting (whether by hand or by washing-machine), you can check as it goes along whether it is closing or not, and ease it open - though I've not had this problem with buttonholes, either.