Why all the garish patterns?

I'm wanting to get back into dress making and have been looking at fabrics, the range is small and all but a couple of the challis fabric that I want are in huge garish prints and totally autism unfriendly. Theres very little plain ones and those that there are in a limited range of colours, only one or two that I'd even consider wearing. I don't want to splash out £300 on a new sewing machine if I can't find the right fabric. Not even AI has been able to help, as everywhere it's sent me its all garish patterns. 

I'm also a bit wary of trusting it as the website it sent me for ear loops is the unfriendliest site I've ever had the misfortune to use and now I'm having an argument with them about returns.