I would say a gift card to a local fly shop would be ideal. Depending how close you are to Austin, you might also grab a copy of this book. Provides great info on selecting the right gear and some local fishing spots, shops, and guides.
The Local Angler Fly Fishing Austin & Central Texas https://smile.amazon.com/dp/1945501243
I forgot this. I’d still go to those two shops, but this helps as well
https://www.amazon.com/Local-Angler-Fishing-Austin-Central/dp/1945501243/ref=nodl_
The Local Angler Fly Fishing Austin & Central Texas (The Local Angler, 1) https://smile.amazon.com/dp/1945501243/ref=cm_sw_r_cp_api_i_M7X1K3G5TCQT571TNNMJ
The Local Angler Fly Fishing Austin & Central Texas (The Local Angler, 1) https://smile.amazon.com/dp/1945501243/ref=cm_sw_r_cp_api_glt_fabc_S5QBJ856S8ASKW6985TE
Check out this book- https://www.amazon.com/Local-Angler-Fishing-Austin-Central/dp/1945501243/ref=nodl_