You need a benchmark and the best ones come from something similar to what you want to do (duh) ... I don`t know about textiles, but our steel and plastic tacos haven`t cost us 100K over three years (more money will always be handy, but you`d be surprised by what you can make happen with bootstraps; e.g. we build our tradeshow booths out of cardboard; we don`t carry excessive inventory; we except/deal with not being perfect in all things!~).
Manufacturing a product can take a significant amount of capital or be done for a small amount depending upon the product, how many you intend to manufacture, your cost target and several other factors. There are usually”trade offs" involved. (For example, if you make it by hand - the investment in tooling may be low but the labor will increase the unit cost)
The investment in marketing for the product can also vary widely. Often those with the "simple" to manufacture products invest significant $ in marketing (Sham Wow)
Some products require an eco system in order to gain market acceptance. That could include distribution outlets, service centers, training programs, etc depending upon the product.
I would recommend developing a Product Plan (which is similar to a business plan but focused on the single product) The process will answer these questions (including how much capital will be required) and can also include the strategy /options for acquiring the necessary capital.
If you`d like to discuss your specific situation (in confidence) send me a PM or contact me directly.