Depending on the manufactuer and the wash of the denim, different types of dyes will be used. Bleach will tend to attack ionically bonded dyes breaking the molecule or complex off, since the Chloride ion will seek out a positive charge and steal it. Thus it will reduce the intensity of the colour of an ionic dye since dye molecules will fall out.

If you are dealing with azo-type dyes they tend to by covalently bonded to the fibres. This type of bond is less susceptable to chloride attack (it is less chemically favourable). However this results in the chloride ion attacking elswhere in the dye molecule or dye complex, changing the chemistry of it, and hence the colours.

they probably turned orange because of something done to treat them while they were being made

Beauty is in us all and this business is all about making everyone feel beautiful. A person of any shape, size and background can own a lingerie shop and approach their customers with knowledge, fashion and compassion and build a strong customer base.

There is absolutely no need to be a designer or even have any experience at all in the design industry. Most lingerie boutiques choose to buy through wholesalers or order their own private label through an X-named manufacturer. It helps to have an interest and passion for lingerie and keep up with what is in fashion, but as a boutique owner they will rarely find themselves in a position to design clothing, unless they want to. One of the best ways to get a constant supply of new designs and keep up with the popular fashion trends is to attend a regular series of tradeshows and conventions.