I would just stick to what you are doing now. You are seling some nice preowned clothing and used items so just stick to being a Private Seller.
With regular selling on this account, you will soon start to receive Promotionnal Offers, which give discounts on Seller Final Value Fees of between 70% and 80%, check your Promotional Offer section on your homepage regularly, if you are offered a Promotion it willl be there and you need to activate it.
One tip be aware, some of your auctions you are starting at 0.99p, if you receive ony one bid you are obliged to sell for that price. With postage and fees, you wisll be selling those items, at a loss. Always start auctions for the lowest amount you are happy to receive, it cannot sell for less, then if you receive only one bid, you will have achieved the price you wanted, and will not be disappointed.
@jbarlow1