As adjectives the difference between snaggy and saggy
is that snaggy is covered in snags, or similar sharp projections while saggy is baggy or loose-fitting.
snaggy
English
Adjective
(er)
Covered in snags, or similar sharp projections.
saggy
English
Adjective
(er)
Baggy or loose-fitting.
That sinks or droops from wear or its own weight.