Police, the Coastguard and RNLI were called to Port St Mary after clothes were left near the water.
The clothing was found at Chapel Beach, where a search of the area and water was carried out.
Sergeant Andy Reed says when they get a call like this they have to investigate the possibility that someone has entered the water and not come out.
It’s believed the clothes have been there for a few days and were left by someone who visited the beach – anyone missing these items, including keys, can contact Police Headquarters.
Yellow weather warning for Friday morning
New novel inspired by Douglas bar
MHK queries planned changes to Sound bus service
Aurora over Manx skies tonight?
Come see farm's one-of-a-kind Christmas tree
Two Manxman sailings cancelled tomorrow
Lord Street plans cut from 14 storeys high to 12
Could your child be the official voice of a pantomime?