How effective are "natural" sunscreen?

With trending of influential videos and other digital material, content on social media promoting use of oil-, mud- or sand-based "natural" sunscreen, skin care experts now are coming up with clarifications on whether such claims of natural sunscreen and skin care products are more effective over traditional chemical, SPF based sunscreens. In this article, the dermatologist informs that applying oil to one's skin will provide either zero protection from ultraviolet (UV) radiation, or very low protection—tanning oils typically have an SPF of 8, whereas protection from UV radiations can be ensured by sunscreen with SPF of 15 or above. Instead of such "natural" sunscreens, one can start incorporating protective clothing like long-sleeved shirts and pants which will act as natural barrier against skin cancer causing UV rays.