What gear will I get issued in army reception / basic training?

ACUs are off the rack and come in standard sizes. ASUs are tailored for pant hem and waist and jacket cuff. If you want any further tailoring, you will have to get it done after basic and pay for it yourself (I'm a female and to get my ASU blouse to fit right, I have to get it tailored, which costs about $25 per blouse).

You will be issued ACUs, ASUs and PTs for clothing and a camelback for drinking, which you will keep. You will be issued basic gear like a rucksack and IBA/IOTV for training, which you will return at the end of basic. You will sign out a weapon (usually M-16 in basic) after the first week or two, and you will take it everywhere with you until the last week when you turn it back in.

tailored well, maybe not perfect. during basic training you will you issued your own gun, basic version which is your to clean carry and use when needed.

Two sizes in the Army: too big, and too small.

Seriously, there are standard sizes, and you will get the closest to your size, unless they have none in stock, whereupon you would get a large size.

the gear you will get, is all turned back in, when you leave basic

the only thing you will leave basic with are uniforms

Clothes come basically in Extra Small, Small, Medium, Large, and Extra Large.

Gear that can be adjusted, is all one size. You have to adjust it to your body.

There is no such thing as "tailored for a perfect fit" in the Army. You get what you get.

Off the rack and maybe you get trouser cuffs and sleeves shortened, etc. Most people fit in standard sized coats and trousers for service uniforms. Are your weird sized?