rickkrennic

I wasn’t actually aware of some of those points @kman. Good to know and thanks for clarifying!

Rebel Legion allows the tall boots for X-Wing pilot if you blouse down the flightsuit so it hides the fact that they are tall boots, but it's not a common option, because those boots tend to be more expensive than the shorter jackboots.
 
Jackboots (Knobelbechers is the German spelling) are far more common.  The same boots and gauntlet gloves are worn by both X-Wing and TIE Pilots, so those work for both types of costume very well.  BUT the tall boots that RL allows (mostly because of the costuming error in that one set of promo photos) won't work for 501st Crew costumes.
 
The tall riding boots, however, are appropriate for the Staff Officers... depending on the specifics of your boots.  501st looks more closely at them than RL does.
 
Do note that the ANH Staff Officer is a very particular costume and not commonly available.  The more common sources are NOT the ANH Staff officer because the Tunic is wrong.

Most X-wing pilots wear jackboots (knobblebockers), but Luke was seen wearing full riding boots not unlike Han Solo or Vader (minus the shin armor).  

But our Crewmen wear exclusively Jackboots.

The riding gloves with gauntlets may pass.

In any case, the final decider is your GML.  Pull the CRL look at the individual parts, and show that to your GML to see what they say.  That will tell you if you are in the right direction.

I believe the x-wing pilots wear jack boots rather than riding boots so, assuming you have these,  they won’t be suitable I’m afraid. 
I can’t comment on the gloves sorry