ITCHY all night! Sleepwear for Sensitive Skin

Hi, I've been wondering whether anyone has problems sleeping with due to a chronic skin condition like dermographia or allergies/hives etc. I've had dermographia for five years. It's becoming manageable with Zyrtec but that doesn't always work. The catch 22 is that it makes me drowsy and for want of sleep - but doesn't always cure the itching!

I'm working on a project to design sleepwear for people with sensitive skin. I'm wondering if there is anything that you can recommend I look into or any information on what people with dermographia/ sensitive skin should wear or precautions to take to reduce itchiness in bed and what fabric is best to sleep in, what drives you to crazy itching (for me it's tags) - basically what works for you and what would you avoid?

Note: I'm allergic to dust- my condition is chronic and will probably last my entire life. I would really love to hear from anyone out there who may be able to offer advice and assistance on my project.

I have itches at night too. I have a strict regimen which helps me.

I only use All Free and Clear detergent, no softeners, two rinses. At night I only wear a really large, thin cotton T-shirt, keep the bedroom really cool. Electric blanket for hubby, which I turn on before he goes to bed.
I use only Neutrogena soaps, bodywashes, shampoos, scrub very gently with net ball-thingy, grease up every morning after shower, only pat dry to keep skin moist. In winter I use a pretty heavy lotion - Curel in winter, Lotrimin in summer, never any perfumes. Some people can't even use the soaps and lotions I use!
I only rarely use any makeup, wash it off as soon as possible.
I wear a long-sleeve cotton shirt and a hat when doing yard work in the summer, to avoid as much sunscreen as possible.
I get allergy shots weekly for dust, mold, tree and grass pollen. I try to avoid my food intolerances. This all helps with itching too!

It seems the consensus is that we end up just wearing sparse clothing to reduce itching which makes me wonder whether if a bigger problem is the sheets?
I'm guessing I should really make a light, breathable garment without sleeves- or at least loose sleeves? I was thinking of cotton but bamboo seems to be organic, incredibly soft and hypoallergenic- though its a bit expensive has anyone worn it before?

Maybe it would be worth the cost if it could convert it into a skirt/ blouse for the day or make it reversible? I think it might justify the cost of the bamboo and at least keep me comfortable in the day as long as it doesn't resemble sleepwear when it has converted. - I'm not sure about everyone else but I'm a design student so I am a little concerned about my presentation but I would like comfort to win out over skinny jeans or constricting officewear but still look a little stylish. Fighting a losing battle?

Sherry and Joy I find your comments on pyjamas/pajamas interesting because I can't stand wearing shorts or pants in bed I would tend to go with the large thin cotton T-shirt like Alcie.
Alcie- Ah the net-ball thingy-it scares me a bit -as does anything that end up exfoliating. I didn't know you could get shots for dust, my specialist told me I could get one for cockroaches which I'm also allergic too (yes, really) but the allergy was auto-immune so it wouldn't go away unfortunately.

I use a net scrubby, too. I enjoy it throughly. I make sure it's the gentle kind.