Hi, i started with clothes about 15 yrs ago. I use a white or light neutral background and began by laying the garment across it on a table. (Avoid putting anything noticeably on the floor). Sometimes i would hang the garment on a good hanger on a white door. Then i graduated to a dress form. (Sell mainly womens.) I use a small frame size 4, even tho some sizes were/are much larger.
I drape the clothes nicely until they look right and then take pictures of the full frontal, back, sides, tags, and any pertinent design elements like close-ups of embellishments. Use bright light when photographing, or lighten up the shot afterwards when editing. Daylight bulbs cost a little more but do the trick, and i have freestanding spotlights now to use with photos. Some sellers shoot their clothes outside, usually on some kind of form or mannequin.
I always ensure the item is not wrinkled, nor the background. I acquired a clothes steamer i use these days but some fabrics still require an iron. (Watch out for delicate fabrics that require gentle handling.)
Below is a link to eBay’s policy on pre-owned clothes. There are some rules such as used garments must be cleaned prior to selling.
My higher-end garments go to the best dry cleaners in town and i spread the cost across multiple sales when needed. When just starting off, these accoutrements and equipment aren’t necessary, but i sell high-end vintage now and these extras have long since paid for themselves in higher sales and price-points.
Many clothes sellers have historically shipped with Priority flat rate padded envelopes for items that fit. Those have to be ordered special from USPS but are free. With the advent of Ground Advantage, you just need to see what works for you and your customers, economically for shipping.
PS—Never stuff nice clothes into a too small package so that it comes out a wrinkled mess at delivery. I will choose a box for nicer things, wrap them in tissue and place in a sealed plastic bag that then goes into the outer package. I do these steps for extra protection in case of bad weather.
Good luck to you as you branch out. Wish you much success.
https://www.ebay.com/help/policies/prohibited-restricted-items/used-clothing-policy?id=4281
