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Where to start? This is a bit all over the place really. Your aim with this is to sell something, this is your shopfront, but people aren't going to trust a website that looks like it's owner has given little thought to how their business looks.
Logo. Where is it? I want to know who's website I've come to, but your logo is closer to the bottom of the page than it is the top, hidden away in that photo. Stick it up in that navigation bar and let me see who's website I've come to.
Colours. Light green on yellow just doesn't work. I'm struggling to read it with pretty good vision, consider how that's going to look to a colour blind visitor? The yellow is a pretty garish background as it is, to put an even more garish colour on top of it is never going to end well.
Continuity. The site design changes. Radically. Having different themes for different sections is fine, but completely different site designs is just going to confuse users.
Sale. Seems like this is the wrong way round to me. You've got most of your normal categories in a really obvious colour, but then your sale link is in a colour that gets drowned out and difficult to see. This is the link most people will want to click, make it stand out.
Homepage. Generally, it's a missed opportunity. Have links to some of featured products on the homepage. The testimonials are a nice idea, but poorly executed. They're not the most important thing on your homepage, and it feels like they're being given too much space.
It also took me a minute to realise the bits of text inside the image on the left were links, and why is one of them in a different font to the rest?
Your front page is the place to really engage people. Who are you, what is your website about, what are you selling. At the moment it's only when you look to the bottom of the page and see the logo/vintage pledge that you discover it's a specialist vintage clothes shop, rather than just a general clothes shop.

thanks so much -- there's some great stuff here to mull over.