Well there are a number of debates regarding pc camps in PiP and Twill. As pirates had no reason to carry tents on board, I would suggest a wedge/lean to style tent that, if you really stretch your imagination MIGHT pass for a sail... if that would suit yer needs, but then again, perchance there be more than ye, the missus and the young mistress...?
Panther Primitives and Tentsmiths are the ones I have dealt with and was happy with both. I think Callenish used another vendor... and if you are handy with needle and thread, Mickey Souris made himself a very nice little shelter, he could give you pointers.
I have seen wedge tents go any where from 150 per tent to 300 (and in many cases poles, ropes and stakes are an additional cost). My wall, which sleeps a goodly number of the crewe when necessary is 12 X 16 and cost about 1500 when I purchased it about seven years ago... Honestly the larger wall was great for Wild West but is a total nusiance for GAoP. Except that Silkie can possibly use it for part of the ordinary some times, I would trade it for three wedges/lean -tos any day...