That answer will change depending on what state you live in. What won't change is that an airsoft gun is not protection and may get you shot or hurt badly by someone who doesn't take time to see your 'gun' is a toy.
There are several different shoulder holsters that can be purchased for concealed weapons. The most popular is from Galco and is available for men and women. Blackhawk makes a custom molded holster specifically for the lower shoulder area.
No
Only if the holster was made for that specific configuration or the laser is in the grips.
Medium size
It should but you should get the biggest holster you can
There are a number of retailers where one can purchase a leather shoulder holster including Cabela's, eBay, Etsy, Cochise Leather, JPB Holsters and Kirkpatrick Leather Company.
Get a Copy of Shotgun News at the Bookstore. One of the holster adds sometimes has Mauser Broomhandle stuff.
shoulder holster by morcheeba
Any of the major makers.
There are hundreds of different holsters- different materials, concealed, external, right or left handed, shoulder holsters, ankle holsters, holsters built into bras, right side up, upside down, holsters for handguns, rifles and shotguns.
That a firearm is concealed from ordinary observation, so connected with the person as to be readily accessible for use. A gun worn in an external holster can easily be seen- not concealed. A gun in a locked case- not accessible. Laws vary from place to place.
Indiana Jones typically has his fedora, whip, shoulder bag, revolver and holster.