This review found no relevant trials comparing the effectiveness of gowns against aprons. Exposure simulation studies suggest that the risk of exposure in healthcare workers is greater with aprons than with gowns but do not provide sufficient data to quantify those risks in the context of primary or community care activity. The WHO recommends long-sleeved non-sterile gowns and gloves for both aerosol-generating procedures (AGPs) and non-AGPs. The US CDC has suggested using aprons over gowns as an additional measure to provide protection from contamination of garments during aerosol generating procedures.
Properly used protective clothing is only one component of a package of personal protective measures (which also includes gloves, mask, eye protection and hand washing / disinfection).
Coles, B., Burton, C., Khunti, K., Greenhalgh, T., Chan, X.H. and Ross, L., What is the effectiveness of protective gowns and aprons against COVID-19 in primary care settings?