Bronze ARC insignia was pinned on each side of the collar parallel to its edge. The Red Cross patch was sewn on the upper left sleeve an inch below the shoulder seam. If a volunteer bar was worn, it was sewn one-half inch below the Red Cross patch. 

A white shirt with the round ARC enrollment pin placed at neck level was worn underneath the jacket. Unenrolled volunteers and paid stuff wore the Red Cross pin at the neck of the shirt. The collar had to be kept inside the uniform.

Nevertheless, several wartime pictures (especially of Red Cross members serving overseas) show the shirt's collar worn outside the uniform due to its better working comfort and more stylish appearance. Such wearing of the shirt was a technical breach of American Red Cross directives because it did not use the Red Cross pin and additionally covered the collar insignia. 
On some pictures one can see that this problem was solved with fastening the Red Cross pin at one side of the shirt's collar and the ARC insignia on the other side.

A matching summerweight coat in the same design as the winter coat could be worn over the summer uniform.

The winter coatdress was made of gray-blue cavalry twill.  During World War II, cavalry twill was a rugged and strong double-twill woven fabric made of worsted wool. The single-breasted dress was closed with six ARC buttons. The four large patch pockets had pointed, buttoned flaps. 

A white shirt with a black four-in-hand-tie was worn underneath the dress. The black leather belt was two inches wide. A black pouch was attached to the belt on the left side.
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The uniform was worn with black shoes and beige or gray cotton or rayon hose. Black or gray gloves were used for everyday wear, while white gloves were required for dress occasions.
 

The Motor Corps Volunteer Pin was worn on the left lapel and the Motor Corps patch was sewn on the upper left sleeve with the emergency first aid emblem (for qualified members) one-half inch below.
Rank insignia were worn on the epaulets.

The coatdress was worn with an overseas cap made of the same material and trimmed with a green piping. The Red Cross pin was worn on the left front of the cap.

Members of the Motors Corps wore a double-breasted gray-blue spun rayon coatdress during the summer months. It was closed with eight ARC buttons, had four patch pockets with buttoned flaps, sleeve tabs and shoulder epaulets. 

The distinctive ARC insignia were placed in the same way as on the winter coatdress. 

A white detachable dickey or shirt with a black four-in-hand-tie was worn underneath the dress.

A plain overseas cap made of rayon completed the outfit. The Red Cross pin was worn on the left front portion of the cap.

The blue seersucker uniform was buttoned down the front with black ARC plastic buttons.

It was equipped with a self-material belt, a breast patch pocket and two vertical slit hip pockets.

The ARC Motor Corps patch was sewn on the upper left sleeve and green colored epaulets were worn on the shoulders. The Motor Corps Volunteer pin was fastened on the left lapel. It was worn with a matching visored seersucker service cap.

The seersucker uniform was introduced during the war because because of its comfort and laundering ease.

The Motor Corps topcoat was made of gray-blue cavalry twill. It had wide lapels, sleeve tabs, a single-breasted front that closed with four ARC buttons and a belt of self-material. 

The coat was worn with green epaulets and the Motors Corps patch sewn on the upper left sleeve. 

The coat was equipped with a detachable green Arlac flannel lining. The flannel was cotton napped on one or both sides to imitate wool, which was in wartime short supply.

This Motor Corps topcoat variation was also made of gray-blue cavalry twill. It had a double breasted front, sleeve tabs and four large patch pockets with pointed, buttoned flaps. 

The collars had green collar tabs with center black stripes. The ARC insignia was pinned at the lower end of each collar tab and the Motors Corps patch  was sewn on the upper left sleeve.