Groom's Gear

Han's standard outfit will probably be what Rob will end up doing,

Since its easier to find at costume stores and online.

This place sells authentic looking costumes

Starfortressproductions.com's Han Costume

Twin Rose Designs
AcrossTheGalaxy.com's Han costume
Jedi-Robe.com's Han Costume (A New Hope)
Jedi-Robe.com's Han Costume (Empire Strikes Back)
Jedi-Robe.com's Han Costume (Return of the Jedi)
hellocosplay.com's Han Costume

Boots
Equestriancollections.com's boots

Costuming References for Han Solo
Han Solo Promotional Shots/Stills 

Kay-dee.net

A New Hope - Han costume Reference 

Empire strikes back - Han costume reference

Return of the Jedi - Han costume reference