For an American style SWAT kitlist, look at the following:
-Black, Navy, or OD BDUs
-Black vest (crossdraw, SWAT Style, "Delta" style, etc. )
-Knee/elbow pads
-Black PASGT helmet or Riot Shield style helmet
-Goggles/Balaclava
-Various dropleg units
While the equipment used by SWAT teams varies by unit and situation, some of the more common types of hardware used by them may include:
-MP5 submachine gun with flashlight grip (Note that P90's will be less common due to unit cost and reduced stopping power against unarmored targets)
-M4A1 Carbine with choice of attachments
-9mm/.40 Cal/.45 Cal pistol with flashlight (various makes, typically Glock, Beretta, H&K, Sig-Sauer, etc. Note that Desert Eagles are probably not going to be carried by SWAT teams)
-M24/Remington 700
-Remington 870/Mossberg 500
-Smokes/Flashbangs
-Plexiglass riot shield/ballistic shield
Optional would be "Flexcuffs" which are disposable plastic handcuffs similar to zip ties. These could be affixed to a kit for aesthetics. For the extremely hardcore, you could look at rappelling gear (try at your own risk). You could also look at a police back patch for your vest.
Some images of SWAT Teams:
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