Sewing Do brocade/jacquard fabrics stain resin easily? / should they be lined?

In my opinion, resin dolls are really not that easy to stain with fabric. The risk of staining is nearly zero for most any fabric I think, unless it had very poorly fixed dye and/or is extremely tight fitting. In general, if you can prewash the fabric it's for the best. The only stains I've ever personally seen came from things like pantyhose, some kind of very tight nylon-y materials.
I do use tons of very dark and colorful fabrics on my own dolls and I've never stained them with any of my prewashed clothes.

 

So, this is kind of a multi part answer...

First, jaquard and brocade are both weaving techniques and says nothing about what fibre or dyes that were used. The risk of staining will be dependant on the combination of dye type, dye method and fibre type.
You can test colour fastness in the usual manner, just like with any other fabric. Look up methods suitable for the fibre content of your fabric, but gerenally things like damping the fabric and putting it in contanct with something that will absorb colour easily, like a clean white cotton and apply heat, friction, preassure or whatever else is relevant for your situation and look for colour transfering.

Prewashing is a good idea for many reasons, colour transfer is only one of them, but this does assume a fabic that can be safely washed. Make a small test and remember to take the fibre content into consideration when chosing detergent. Seal the edges before washing, brocade especcially is a technique where threads are "floating" on top of the weave and does often unravel easily.

Lining a garment will make a differens to drape and bulk. You need to take that into account when choosing fabrics, when creating your design and constructing your patterns.

I know this was no absolute answer to your question, but hopefulle it can stear you in the right direction for figuring out what tests to make and how to handle your fabric.

 

You got a very excellent in depth answer about a lot of other factors but if I may offer my humble opinion again, really, resin dolls don't stain so easily.
So what are you planning on making? Will it be tight as a second skin? If not, already less worry. From there, you can wash most things at least by hand with detergent and if it's not bleeding color you have a good indication the dye is not in excess. If you got the fabric at a common chain store at this point it's most likely synthetic blend and plenty of those are used on doll clothes, which if they are on a resin doll, once again, hardly ever an issue.
I've prewashed for all my doll sewing normally (though I don't like to use drier sheets) and it did not ever hurt my dolls. There comes a point where your dolls simply won't be living in a vacuum. Even if you touch them only with gloves they at least are in the air, they get exposed to minor things and those minor things are not what cause big problems.
If your doll does get any color transfer usually it's only on the surface of resin anyway and you could wipe it off with a wet magic eraser sponge.
I hope any of this is reassuring at all! It's good to be cautious but I think you don't have so much to worry about except for the tiny chance of a weird accident and hopefully you'll be able to just have fun.

 

I've been sewing for my dolls a few years and never had any issues with detergent. It hadn't even occurred to me until this post that detergent could be a problem. I don't recall hearing about anyone else having problems either. You could pre wash and do an extra rinse to be sure.

If you're nervous and it won't mess with the drape, you could line the garment anyway. Even if it isn't necessary, it might keep you from getting too stressed about staining. Maybe check the doll or change its clothes regularly to catch any potential staining before it has time to get bad.

Resin isn't that easy to stain so it'll likely be fine. You've probably heard a lot of staining horror stories, or at least the general fear, but those have been compiled over the entire length of the BJD hobby existing. A good portion could have been avoided with common sense and/or the knowledge we have now. One collector taking reasonable precautions isn't likely to end up with a disaster.

 

Synthetics don't usually blead colour if they are properly dyed. This means different things for different fibres. Some are dyed right from the start, in the production of the fibre itself and this means the colour is part of the actual fibre, so no risk of bleading. Some are dyed in ways that are designed to adhere to the type of fibre specifically and those are safe as well, when used properly. This later category does not just inculde synthetics either.

In my experience, the most problematic fabrics are those that are either dyed to match something else after production (elastic lace often have this problem, so does fabrics from clothing industy outlets, but there is no hard and fast rule) or dyed in such a way that they are ment to loose some dye over time (such as blue denim).
Blends can be extra difficult if they are dyed after the fact. A silk/rayon blend for example would either be dyed for protein fibres for the silk or cellulose fibre for the rayon and those as different dye methods, meaning that at least som of the fibres in that fabric may not be properly dyed.
Rayon/polyester blends have a similar problem with the added factor of polyester being rather dye resistant to begin with.

Detergent shouldn't ba a problem for your doll, but may damage the fabric. You do need to know the fibre content before washing something. The main danger is protein fibres such as silk and wool that will be damaged by regular detergents made for plant based and synthetic fibres. Read on the bottle and see what is says. If you are unsure, a soap-based detergent is the safer chioce.

On the whole, I agree with AlisonVonderland and Azure Agape that you probably don't need to be too worried about your doll. They are pretty tough and just like fabric fibres they need dyes made specifically for their material to really change colour permanently. Most stains are just transfered dye and as long as you pay attention and remove it right away it's usually not a problem. The exception is if your doll has a body blush that you really want to preserve.