Bit different opinions for the lighting. Do you think I'll be fine with a camera mounted flash or do I need to get lights and umbrellas ?

I like the jeans in the first pic, a lot of pro product photography pics (basically what's sold on 99% of clothing web sites), I think they use the whole lighting with umbrellas, looks some what plain in my opinion. I like when the product is shown bright and the background is a bit darker, and camera flash reflects off the clothing to make the clothing glow in the dark almost. The ones with the super white backgrounds makes the clothing appear dark and in my opinion not tasteful.