Lycra stretch for shrouds

[ecormier]

I'm looking for advice on how much stretch to factor in when making a DIY truss tube shroud out of Lycra. I've sourced a 95% cotton / 5% lycra fabric with 25% four way stretch. I'm going to get a local seamstress to sow it for me, but I'll need to provide them the dimensions.

I'm also interested in the amount of extra length that needs to be factored in.

Yes, I'm aware of Shrouds by Heather, but the $55 USD shipping to Canada is too objectionable. Otherwise, I would just go with them.

Is there someone in Europe who makes them? I sometimes find that it's cheaper to ship to Canada from Europe than from the US (go figure).

EDIT: In case in matters, the dimensions are for a DIY 20" f/3.3 dob:

• 83-3/4" circumference of the bottom ring of the upper cage (213cm)
• 87-1/2" circumference at the mirror box (222cm)
• 40-3/4" length from mirror box to top of lower cage ring (104cm)

Edited June 11 by ecormier

[ecormier]

Someone suggested to me in private correspondence to pin the material around my optical tube the way I want it, and just bring the whole thing pinned to my seamstress. Seems so obvious now, heh.