Haines, Sanchez and Dave of the FIB meet up with Michael, Franklin and Trevor in the middle of nowhere. They need them for another job to retrieve funds from the IAA. The trio agree, but they need to prepare some items first.
This mission is very quick and easy. There is no action involved as all you have to do is purchase three boiler suits. Here is everything you need to know about the Boiler Suits mission and how to get its Gold Medal in GTA 5.
Boiler Suits Mission Guide (Gold Medal) – GTA 5

Gold Medal Objectives
Keep in mind the following objectives throughout the level to get a Gold Medal at the end:
- Quick Shopper: Purchase all outfits within 30 seconds.
- United Colors: Purchase a different color for each character.
Mission Synopsis
The mission begins with a meeting between the three protagonists and some FIB agents. They’re gonna request more help from Michael, Trevor and Franklin regarding another matter.
The three are not happy about it but are forced to accept anyway.

After the cutscene is over, all you have to do is head to the Ammu-Nation in Strawberry in South Los Santos. This mission can be accomplished using any of the three characters.

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All you have to do is head inside and purchase three boiler suits. Make sure to be quick about it and purchase three different colored boiler suits for the Gold Medal.
Head outside once that is done and the mission will be over.