Hi KISSANEPAT1, and welcome to the site.
Ebay first, and yes you can change your ebay id if you would like to without loosing your feedback. You can change it as many times as you like, but once changed you will not be able to edit it again for a period of 30 days.
You will be able to do this from your 'my ebay'.
Regarding importing clothing, I would actually suggest you take a close look at the liquidation market for these types of products. Some great savings on loads on new overstocks, but you always have to make sure of what you are buying as liquidated stock can also contain customer returns, along with other clothing not really suitable for sales.
I would suggest taking a look at Link hidden: Login to view. There are many that deal in the field, but they are the ones I will usually recommend as they have excellent customers service and do ship worldwide, so will be able to assist you in that area as well.