Depending on the style you can go down or up based on your own personal preference for fit and look. Different body shapes may also fit better in a different size. Our pieces tend to have very nice stretch.
If you're unsure of what to size off of, the chest for tops/dresses tends to be the most important measurement to check as our pieces have such a good stretch that even if you're more rectangular shaped with a waist nearly matching your bust, the waist of the garment will very likely stretch to fit!
Also the larger a garment gets the more it can stretch as it has even more spandex in it! So smaller sizes can stretch 3-5" while larger sizes can stretch 5-10".
Are you Petite? You likely will want to size down in spandex dresses and tops as they're so stretchy. So if our models with similar measurements to you but tall are wearing a given size you may prefer to go down one size in spandex. Knitwear cardigans and tops may be similar but if something says it has less stretch than our usual knits we wouldn't recommend sizing down. And of course additional hemming may be necessary for things with skirts.
Are you Tall? We don't recommend sizing down as the garments will be shorter on you. We wouldn't recommend sizing up as the shoulders and body may be too large for you. We recommend ordering the size comparable models are wearing.
When we have combined sized styles it means you should still buy the size intended for your measurements. However combined sizes tend to be oversized so you can go down if you'd like a less oversized fit. (It's best to only go down if you are the smaller of the two combined sizes, if you're the second size in a combo size you may hate the tighter fit)