Any of the following might be heard (your first sentence is almost right; the second is grammatical but not used: the phrase "upward of" is considered coarse, "country-type" speech and is not used in a fashion context): Any heels from 7 inches on up are considered very high. Any heels over 7 inches are considered very high. Anything over 7 inches in a heel is considered very high.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
Any heelsfrom7 inches and up/onare considered very high. includes heels of 7 inches
Any heels upwards of 7 inches are considered very high. doesn't include heels of 7 inches